First off I'm not going to say I understand what your going through because I hate it when people do that, so I'm just going to tell you what my situation is at the moment.
I'm 23 and I have somewhat similar seizures you are having (except less vomiting and the sensation is not quite as bad), and I have been medicated for about 5 years now so my seizures aren't as frequent. My neurologist assures me i have, and I quote: "complex partial seizures centering from the left temporal lobe", but other than that I am a normal healthy guy (serious, I asked what was wrong with me one day and the answer I got was "we don't know"). The meds I'm on give me weight loss which probably isn't a good thing since i'm quite thin as it, but its all good, I just need to eat more to make up for it. I had a dodgy memory to start with, and yes the meds have shot that to hell, I mean i have my moments, but its all good in the end.
I hope I have helped a little, anything you want to know I might be able to steer you in the right direction, I have been on 4 different meds (on lucky number 4 now, YAY!) or if you just want a bit of chat, i'll be more that happy to be to lend a hand. Good luck, and the most important thing I can say is BE POSITIVE, I know its cliche, but it works, stuff happens and you just got to get up and get over it and it sounds like you have a good friend to help you do that.