Hyperthyroid... Something else?

I guess I should start by saying that I am 28 and male. Started having panic attacks about three months ago so I decided to go to the Dr. while at the doctors office had a heart rate of 150. Well lets just say the Dr. did not like that much so I have underwent a multitude of test including EKG, Echo cardiogram, CBC, Sedimentation Rate, and Electrolyte. The only thing they told me was my white blood cells were high and that I had a kidney stone everything else checked out fine and referred me to a cardiologist. Went to the cardiologist and he noticed that I had splinter hemorrhages on a couple of fingers and some red spots on my arm so he wanted to make sure I didn't have endocarditis. He looked at the blood work, echo, took my temperature, and listened for a murmur. Said for sure I didn't have that so started looking for other problems. From my medical record he noticed that I have lost almost 25 lbs. Then he listened to my throat and immediately ordered a blood test for hyperthyroid and put me on a beta blocker. I don't see him again until next month so the waiting is killing me. So I thought I would ask here about my symptoms and see if anyone else has had a similar experience. So here is a list of what is going on rapid heart rate (seems the beta blocker has helped used to happen all day everyday), panic attacks, weight loss, muscle weakness, headache behind eye, occasional dizziness, extreme fatigue, hot flashes, very extreme mood swings, and insomnia. Can't really think of anything else to add. I know no one can diagnose me on the net just want some opinions from people who have experienced the same symptoms or knows about them.