anyone who has had thyroid problems or knows anything about thyroids please read!?

I'm an 18 yr old girl and I have posted questions for the past few months now about my health because I have felt horrible since November! I have been to 3 doctors,one because we thought maybe I had anxiety. The anxiety excersises helped some but I still felt sick all the time. I have no energy,I'll feel out of breath or feel like I'm not getting enough air sometimes,I feel cold when everyone else is hot ( I put on a jacket the other night it was 80 degrees) I'll feel dizzy,always tired,will feel like crying sometimes out of the blue or get angry quickly,and I will feel hungry like an hour after eating. And not just hungry I will literally feel as if though I haven't eating all day! So anyways yesterday I went to my doctor because I am so tired of feeling this way and she sent me to a hospital to have some blood tests and an EKG done. My older sis is a nurse and she thinks it has something to do with my thyroid. I won't hear from the doc until monday,So i was hoping anyone who has thyroid issues or knows a lot about them if they could post their experiences and if it sounds like I have it. I just want to read up on it some more and kinda know I'm not the only person who feels so different than I did last year! I used to be peppy and always wanting to go. Now I'm tired and I feel nothing like myself. Sorry this is so long....It's just sop frustrating to feel this way for 9 months and not know why! Also I have a job where I talk a lot and I've noticed my voice will sometimes die down and my throat feels sore more often...is that also symptoms of thyroid problems! Thanks to anyone who bothers to read and answer!!!