Pescatarian vs. Vegetarian...

I don't think I'm a true Vegatarian, at least not yet. I can do w/o most meat b/c it tends to upset my stomach and it really isn't good for my particular digestive system. Seafood however doesn't cause me pain, I love the taste and I eat a couple servings of fish a week. I completely failed at being a vegan, that lasted for about 2 weeks. But I've been vegatarian off and on for the last 3 years. My longest stint was a period of about 8 mos. The last time I tried, I was able to go about 3-4 months.  I would like to try to be vegetarian again, but I'm having the hardest time giving up seafood. I'm a pretty logical person (hopefully my wife would attest to this). I don't really have a logical reason for giving up seafood other than "Being a vegetarian is healthier".  But that doesn't seem to be enough. With meat, I could say "Meat upsets my stomach", and then it's easy to quit. But with seafood... no such problem. 

Any advice? Or maybe I should just stay eating seafood? And for those who like eating seafood, do you notice any health benefits? For those who don't like seafood, why not? THANKS!

That article was informative - i am  gong from eating clean to vegetarian, an dam starting to revise my thinking about just going vegan. It caused me to ;think a great deal, as I eat a lot of salmon...some decisions i have to make.

Vera