It sounds to me as if you need to get a tilt table test done for POTS (Postural Orthostatic Tolerance/Tacychardia Syndrome). I has the same symptoms for about 2 years and even got to the point of fainting upon standing, etc. They thought it could be inner ear problems but ruled that out and finally Dr. Coughlin a cardiologist at the University of Alabama Birmingham did this test and found out that I had this. Your symptoms sound very similar to what was going on with me. It might not be this but it would be worth mentioning or having someone check it out. Good luck.
Well I'm no expert but I have had a few of those symptoms, I'd say probably anxiety related, well thats what my doctor told me, also have you ever had your thyroids checked, your thyroids can cause alot of those symptoms, I thought that was my problem but my thyroids are actually fine, my doctor says I suffer from mild anxiety. But you definitly want to rule out any heart conditions.