Pre-takedown was maybe the worst time of my life. I'm assuming you have an ostomy and external pouch. I just couldn't stand it. My seal broke ALL the time. I couldn't work because my stomach was always awash in acid. I cried often because I felt useless and I worried the pain and inability to work would never end. You're not alone. Those 2 months were awful for me.
It got a lot better right at the end. Suddenly my seal wasn't breaking, I had a routine and knew when to set my alarm once nightly to get up lest I get a blowout. I was feeling strong again. The next surgery is hard too. but I feel like there is a light at the end, I know some people have rougher goes at certain stages, but I've spoken to several people I know personally who have J-pouches decades post takedown and they say it is hard at first, but the body adjusts and they live as normal a life as anyone else.
I like everything skn69 said, find a hobby or something that you really enjoy, splurge on it if you have the money, now is a time to let yourself enjoy certain things while you aren't able to enjoy the simple things like feeling normal. Don't try to be alone, some people are difficult to deal with, but without my family and friends and their support I know I would have been in a much darker place. My wife kept me out of a dark place most of the time.
Don't let your pouch or the surgery be a focus for a little while. It's important to tackle the emotions of the surgeries, but don't let it consume everything you do and who you are. Do something enjoyable, play a game with family, watch a movie with family, just have diner and reminisce about fun times.