Sorry to hear about your foot issues. Pain and nerve damage are not fun at all! I've been on Lyrica on and off for the past several years and it's not a fun medication to take.
On the other hand, I can say that for me, it does keep nerve pain in control.
I gained about 5 pounds when I started taking Lyrica and by really watching what I eat and exercising (after I got my doctor's approval...wait for that, cause you really don't want to cause more pain!) I haven't gained more! However no matter what I do I can't get any more weight off. My husband keeps reminding me that if I just give up, I probably would weigh a lot more. So, just to encourage you, really be mindful of what you eat, and know that there is more to taking care of your body than a reading on a scale!