How can I get tested for Dyslexia?

Hey.  I don't know much about dyslexia and I don't mean to be diagnosing myself, but some of the symptoms I've been reading up on do ring a bell. I've always had problems with spelling, and sometimes when I speak I get sounds mixed up. I'm 20 now and at University doing and English Literature and History so my problems haven't exactly been debilitating, but I have noticed that it takes me twice as long to read or write anything than any of my classmates and it has been like this since I can remember. I also have trouble thinking on my feet in conversation as I have to take a few seconds to find words to express my meaning, and i have to avoid words that I find difficult to say. My coursework marks have always more than fine, and as a result I don't think the problem is with my intelligence.
I realize that if I do have it would be only mildly, but it would explain a lot and would help me in the future. I just wondered if there is anywhere I can go to get tested for dyslexia, and if the symptoms I've mentioned indicate that I have it?

[Buffheart]

A therapist might know