The heel pain sounds very much like plantar flascitis, I too suffered from it after my colectomy as well as others have. I don't remember the reason but there is one. Fortunately for me I had the condition while in college and still had my custom orthotics which I put back in my shoes until the condition cleared. This is a tricky thing to treat. The most important advice I can give you is to get some type of shoe inserts that are very firm (hard). I know it seems counterintuitive, you feel as if you need something soft and squishy to walk on but that will not correct the problem. There are exercises you can try too, they can be found online.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free