Steroids will make anyone off the wall let alone chronic illness and continual pain and discomfort.
Unfortunately for both of you, it sounds like your spouse has been through ALOT. Your spouse is angry at his situation,not you. The anger is misdirected at you as you are the closest person to him. If he has had jpouch surgery, this is a very difficult experience for most people and if he has troubles after the surgery as many of us do or have, it can make getting along with anyone difficult.
I know I can tell you to be patient, but it is equally as hard for the well spouse as it is the sick spouse as you feel helpless about the situation because it is out of your control and the typical response when we see our loved one hurting is try to and help fix things. Counseling may be a good idea for your spouse to deal with the illness and ramifications and possible depression as a result. If he needs anti-depressants or some pain medications to help him through this period, a qualified MD and therapist can assist with both. I am sorry for your situation as I can relate to it very well.