I also just had ileostomy surgery. I am only 3 weeks post-op. I am also very tired and not myself. I have had other intestinal surgery since I was diagnosed with crohn's. This by far is the most difficult recovery. I am still taking pain medication. The pain is improved but if I do something like make dinner or fold laundry, I am very sore and exhausted. Give yourself a break. Some people take longer to heal. You mentioned that you gained 40 pounds. Is this a positve for you? I couldn't tell from your post. Give yourself more time. Two months isn't really that long to recover and adjust to such a radical change your body just went through. Hope you get better soon.
