Will I get sick if I start eating meat again?

I’ve been a pesca-vegetarian for a year now, and I’ve been getting really sick so I’ve decided to go back to eating meat : ( I’m not happy about this decision but my boyfriend and family are concerned for my health, and frankly I’m not too thrilled about being ill all the time either. Anyway, I’m supposed to start eating meat today. Will I get sick if I just all of a sudden start eating meat again? Better yet, are the ways to be vegetarian and not get sick so much?

http://ping.fm/usw3o