Plain and simple: You have too much thyroid in your body. Your thyroid gland is overproducing. This will make you jumpy, irritable, give you insomnia, hungry, heart race, HOT (when everyone else around you are cold), etc. emotions OUT OF CONTROL, I also had major muscle twitches.
The doctor will either: give you meds to suppress your thyroid, give you synthroid that will allow your thyroid gland to take a break, offer RAI (Radioactive Iodine), or surgery.
This is a very serious medical condition. Do not ignore it. It could (literally) kill you.
About.com has some thyroid websites.
Graves is an autoimmune disease. Your body starts to attack your thyroid, your thyroid responds by pumping out more thyroid hormone. It's an evil circle.
Sometimes families generally have high instances of autoimmune disease running through them, diabetes, lupus, thyroid diseases (graves and hashimotos) etc.
My thyroid story:
I also was diagnosed with Graves about 1 1/2 years ago. Heartbeat at 110 sitting still, mind in a fog, jumping out of my skin all the time. Couldn't sleep through the night - it was horrible. Had to take meds to slow my heartbeat down. They made me like a zombie. Had the RAI done twice, 10/00 and 12/00 first time it didn't slow my thyroid down at all! More hyper than before. Soooooo tired, had to try to take naps in my car at lunch.
After 2nd dose of radiation (highest legal dosage permitted without hospitalization), I went VERY hypo (TSH 160). Had to quit my job - I couldn't get out of bed. I was on Synthroid 1.50 Gained 30 pounds (normally 120, went up to 152). Switched to Armour Thyroid (natual thyroid from pigs). I started to feel better physically, but no weight loss.
So here I am 18 months later, 32 pounds heavier, and on Atkins. I have lost 8 pounds as of this morning. Started on Feb. 28th.
I feel much better than I have in years.
It's a horrible disease. But with medication, it can be controlled, like so many others.
ps. Sorry to have written a book