Tackle it from your diet. It takes time but definitely worth the effort in the long run. I used to suffer from these symptoms and even black-outs. Since I started paying attention to my diet, I began to have fewer episodes until they are completely gone by now.

I am not trying to promote any FAD diet but take a look at the concept of "South beach diet", which helped me big time. It's not very hard to follow either. Eventually it will become a life style (to eat).