Alex,
Your symptoms sound like they are right out of "textbook" for POTS, so hopefully that puts your mind at ease somewhat. There are many different lifestyle changes and medications that can be tried to alleviate the various symptoms.
You may find information in our Health Pages that is helpful in learning more about POTS symptoms, POTS treatments, etc.:
http://www.medhelp.org/health_pages/list?cid=196
Just a note that our health pages are a continuous work in progress so please "pardon our dust."
Feel free to continue asking questions, and welcome (if I haven't already welcomed you? sorry, bad memory) to our community!
-Heiferly.