Hello Sue,
Welcome to the Pain Management Forum. I am very sorry to hear about your headaches and accompanying symptoms. You must be very concerned and a bit frightened. My heart goes out to you.
While you are more than welcome here I think your questions and concerns will be better addressed on our Migraine and Headaches Community. I encourage you to post there also. I have copied the link for you.
http://www.medhelp.org/forums/Migraines--Headaches/show/123
Your symptoms could be related to a number of disease process of conditions. Yes there are also the obvious diagnostic tests that should be considered. However there are no physicians on the forum. So though we can guess at what may be happening only a skilled medical provider can offer you a diagnosis. Given your symptoms I strongly encourage you to see you PCP as soon a possible, unless you are already being treated by a specialist. Therefore whom ever is treating your headaches would be the physician to contact. Please don't ignore them.
I wish you the very best and hope that you will let us know how you are doing. More importantly consult your physician and please post in our Migraines and Headache Forum.
I'll be thinking of you.
Best of Luck to You,
~Tuck