Hi, 

I have a weird reaction: sometimes over dinner I start feeling lightheaded, and it happens almost immediately after swallowing. It happens right in the beginning of the meal. During that time I being to get lightheaded and more and more light sensitive. Because I was getting particularly weak a couple of times, I had to go lie down since I couldn't continue eating.

I have been diagnosed with IBS, but I don't think this is a symptom...

Thanks!