I have a soy problem too. I think for a long time I ate waaayyyy too much of it, and I felt terrible. Reaaaalllly terrible.
I went cold turkey on soy, while still remaining vegan, and feel much better. After about 8 months or so of NO soy, I now have it occasionally (maybe once a week if that).
As kaydee said, there are lots of other alternatives if you are interested in staying vegan.
On another note, I know there have been brief times where I just felt I needed something more, so I've temporarily gone to including some eggs (from my neighbors chickens) in my diet. I do it for a while while I'm feeling I need it, then I go back to total veganism. Mild grosses me out, so I don't feel the need for that (although, I do sometimes miss cheese, I'll admit it!).