I completely understand. I also did it "cold turkey" when I made the switch.
Now, I'm less strict. I still don't eat meat or fish, but I've used a beef stock for a stew once (it was in the house already), and sometimes, I chew gum with gelatine in it, and I've had a dessert with gelatine in it on a restaurant (didn't realise it before I got it). I try not to buy anything with gelatine in it, but if someone hands me a piece of gum or candy that I know contains gelatine, I'll take it and say thank you instead of refusing it. I'm at a point right now where I feel so confident and happy about not eating meat that I allow myself to eat what I want, because I know I won't end up gorging a hamburger.
Good luck on your new lifestyle! If you need ideas for nice vegetarian meals, check out smittenkitchen.com
There are a LOT of vegetarian recipes (I'd say 90 % are vegetarian), and they all look amazing.