Have you tried drinking large quantities of water? This isn't what I would consider normal. Especially with the feeling lasting so long. If you don't know what heartburn feels like, perhaps you had did just have something to eat that didn't agree with you. Also, my bet is that throwing up didn't help matters as it probably irritated your throat more. I'm not a doc, and can't really give you professional advice.

I will agree with you that those Lamictal tabs are large. I had the really big round ones in the past. My latest couple of scripts have been 5 sided tablets and go down much easier. I don't have my script with me to let you know the manufacturer, but could check if you'd like.