Thanks for the responses everyone.
My Doctor says that it helps "lots" of people, but I'm just not convinced. I stopped taking it a few days ago and haven't really noticed a difference at all. If anything, I might actually be slightly better without it.
I saw a Naturopath yesterday and discussed it with her, and she didn't seem very shocked that it didn't work for me because likely I'm deficient in something else that prevents the 5HTP from being utilized by the body anyway. She's done wonders for my wife in balancing her mood and solving a few other medical mysteries that traditional medicine just hasn't been able to help us with, so I do think she knows what she's talking about.
I also mentioned Magnesium supplements to her as I've read and been told often that magnesium helps balance the fight-or-flight mechanism (or something, can't remember specifics), but she even seemed to think that it might help, but I'm probably not taking enough of it to compensate for what I'm lacking in my body, and Magnesium also acts as a diarretic (sp?) so taking too much would almost ensure a life filled with MANY trips to the bathroom, which obviously isn't ideal (though, is it better than living life with these anxiety symptoms?).
So 5-HTP might work for some, but from the responses and my own experiences, it sounds like it's a dud, at least for anxiety.