I would just put all those past issues behind and pretend this is the first time you are having surgery to create your jpouch and go into it with a positive attitude. I've seeked legal advise for the terrible treatment I received in the hospital and even the radiologist not following my surgeons orders to keep a drain in for my infection and he removed it so I had to get a repeat procedure to leave a drain in the next time around. They even fired the staff the day after. I also had pictures of how unsanitary the place was and all the pain and suffering I went through due to the incompetence of the staff. The lawyer advised me that this stuff happens all the time and even gave me examples of cases that were worse than mine that he thought would be a slam dunk that they lost. The the lawyers I'm speaking of are the best around my area. These Drs and hospitals are so protected that you have no chance because a while ago people sued the hell out of them for medical malpractice like crazy. I'm not trying to discourage you but I went to this lawyer with what I thought was enough firepower to put the hospital out of business and was told he wouldn't even risk putting down the money to take the case. You can certainly try if you think you have a case but just don't go into it with high hopes because that's what I did.
Anyway it seems like you have been through a lot of uncomfortable days in the past years and now is your time to get better and enjoy life like you originally planned. Believe and things will fall into place. Good luck my friend. You will be just fine I'm sure.