Sorry for your loss. Been through it as recently as 2 years ago. Everything happened when her legs would give out too (could describe it as almost temporary paralysis). She developed epilepsy shortly thereafter which was tough because you are helpless when it happens (even with prescribed meds from the vet). Her epilepsy eventually took her life when she had a cluster of seizures in a short time frame.
Everything is going to take time and it’s an adjustment from your everyday routine. You’ll never stop thinking of Casper and how he enriched your life on a daily basis. I feel the pain you are going through. I’m so sorry for your loss.