I am so, so sorry for your loss. I know how hard it can be. People say things like "they're just animals" but pets can be more like family than your real family can. I know I treat my cats like my kids. Last year, my cat broke his leg somehow, and the vet bills were too expensive. We almost lost him like, 4 times. He was given to the humane society without my consent, and I literally choked the vet who told me. I threatened to burn down their clinic if they didn't get my cat back.
I took a really, REALLY bad job in order to get the money, and eventually I was able to pay for his surgery and get him back. But it was one of the hardest things I've ever gone through. I had no support from anyone, and no money to get him back. It was terrible, knowing that if I didn't come up with $3000 within a week, he would be put down. I couldn't stand it. Everyone kept telling me to just put him down, but I couldn't.
I don't know what I would do if either of my cats died. Especially if I was already dealing with a flare. That kind of stress and sadness would probably send me to the hospital. I'm so sorry that you have to go through this. I'm not sure what else to say. Obviously you will get through this, but I know it's gonna be very difficult. Just know that we're always hear for you if you need to vent, or whine, or complain or just talk.
Take care of yourself <3