I can say that I have had similar symptoms within a year or so of my reversal. I am now about 2.5 years out and am feeling pretty normal. Early on, however, I did experience a good deal of leg pain, or more precisely aching, especially when I moved around. For me it appeared to be part of an inflammatory response related to having pouchitis. This also translated into joint pain, especially my knees (In fact, I had to get them drained a couple of times). When I got the pouchitis under control, then my leg and joint issues eventually went away. I'm not suggesting that you have pouchitis - just saying that was the case for me.
With respect to gas pains, I had those for quite a while too. They began to diminish when I started taking probiotics (I was prescribed vsl#3 ds to address the pouchitis). Gas pain and gassiness in general is no longer an issue for me.
I still react to eating, although not as quickly as you. But eating does seem to stimulate bowel movement, which is why I try to avoid eating very often during the day.
The bottom line though, is that I too think you should discuss your symptoms with your doctor as I think you should be doing better.