Ugh man. Yeah, I have similar. My typing fingers that are most used are farked. Got some steroid injections in them and it fixed them up temporarily. Did MRI and other electrical nerve tests and all ok there so it's just like tendonitis and arthritis. I do a lot, a lot of stretching my ligaments and tendons in my arm. I've gone to a crap ton of physical therapy. Just gotta work on it and go to the doc. Put some foam on your flipper buttons maybe.

My wife has some joint issues and does like 45 minutes of stretches and exercise a day for that specifically on top of our twice daily yoga, she's a beast. She was also going to PT 3 times a week and they helped her a lot with various tools and exercises. Hopefully your wonderful country has drastically better healthcare than we have.

Interested how you've overcome tennis elbow. I have been fighting for eight months. I have been able to work out but not as of last three weeks. I'm still in shape but this sucks. I rest on the machine when I play, arms locked. Is that the issue? I'll dump these things if it means not getting better.

I have wankers cramp in my wrist!

Honestly, I work for physicians and they say most tennis elbow in men over 35 is from that. Let's say I switched hands.

I am also ambiwanksterous.

Tennis elbow? I am dealing with pinball elbow. Right hand elbow.

I take double doses of vitamin B-6 and vitamin B-12. The pin elbow is still there but is slowly going away. At least it does not hurt now and I can play.

B-6 and B-12 were how I managed to keep working on a tractor assembly line in 2004. That job was torquing down 9/16” nuts and bolt all shift long.

You all might consider the “B”s.

Just read an article said D plus calcium increased risk of stroke.

Cortisone. Then moderation. Then more cortisone a year later after overdoing it. A vicious cycle for seniors.

see a doctor - hand injury specialist.

I have chronic tendonitis and used to golf and play pinball a lot which was horrible for it.

These exercises worked so well.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2971639/

I've also used voodoo floss successfully to treat it.

I would agree, the doctor will let you know exactly what movements are irritating it and provide exercises and therapy plans and/or a brace. Most therapies you can do at home. I had a similar issue to you(index finger and thumb). The key for me was to stop aggravating the injury. Apparently, that makes it worse, can cause permanent damage and increases healing times. It's difficult to do, I wore a brace, did therapy as I did not want surgery. After a couple of months, it went away, I strengthened it and the problem hasn't come back.

I took months, I've read 2-6 weeks healing time which assumes you stop re-injuring it.

https://www.webmd.com/fitness-exercise/understanding-tendinitis-basics

Try switching which fingers you use when playing pinball. It's not hard to get used to using your middle fingers versus your index fingers, and you can switch back and forth depending on how you feel.

Sorry to hear that. Been suffering with a mix of tendinitis in my index finger, tennis elbow and bum shoulder all on my right arm.
I work as a dairy lead in a grocery store. One of my daily jobs is to refill the milk cases so have to lift hundreds of gallons of milk daily. Been doing this for 10 years now. Lets put it this way, my whole right arm is constant pain from my index finger to my elbow to my shoulder. Been getting Cortisone shots for years now.
I take vitamins, aspirin and keep everything wrapped when it flairs up bad. I can't play a lot of pinball any longer. Some weeks I only play the 4 games I need to play at league. On good weeks I can play a couple games a day but can't over do it. If I go to shows and spend the day playing games you can bet I'll have my arm wrapped and a wrist brace with index finger support for the following week. On a side note, I've completely given up play any kind of video games. Can't even lay my old NES or SNES any longer. Getting old sucks.

Cortisone is temporary and is weakening the ligaments and tendons in the long run. It only cures the symptoms not the problem. Taking NSAIS ( Nonsteroidal anti-inflammatory drugs )is not good also , since inflammation is a way for nature to fix things up. eliminating inflammation will make things worse eventually. Listen to your body , rest your fingers and wrist , avoid anything that causes pain. using some ice in moderation when there is a flare up is a good alternative choice over medicines. when / if eventually you feel better start exercising and strengthening your joints. there are a lot of sites to look for advice.
Curcumin is a natural Anti-inflammatory to use if the pain is not bearable. Also Collagen , and Glucosamine will help to lube and strengthen the joint.

Ive had Kenalog, a synthetic cortisone thats super thick and stays in the area, on both hands.
So far, after 6 years on the oldest shot, I havent had to go back.
This was decided because of my age over anti inflammatory failed

Trigger finger sucks!

just use your middle finger.