The thing is.. plenty of people suffer from agoraphobia that are not vegetarians. I had it for a while, years ago. It followed the death of someone in my family, not the day after, or the week after... but sometime after to which it didn't seem related. Sometime something bad happens, and it just shakes the foundation of feeling 'safe' out there. I don't know if you spend any time outside, but if not, try to just go out in your own yard and spend sometime sitting in a chair or walking around looking at your plants. You need to reconnect with the 'outside'.
On the other hand, if you really believe you are defficient, I was going to say and notice you added it to your last post, that eggs have everything in them to make an animal, so you could get the same thing from an egg as from meat.