Over the past 3 months I have been experiencing the most horrible symptoms. My symptoms vary and I have no idea what triggers them. I can be sleeping, laying down, at the store, sitting, it doesn't matter. My symptoms include, extreme chest tightness, dizzy spells, numbness on the back of my head, hoarse voice, closed throat, cold sweats, and weakness. I suffer from mild asthma and hypothyroidism and I was recently diagnosed with Hashimoto's Disease. I've been to the ER 6 times with these symptoms and I've had x-rays, MRI's done, EKG's, a stress test done, CT scans of the lungs and thyroid, and nothing shows up! The docs say that i just have anxiety and i do agree at some point, i mean who wouldn't panic if you can't breathe? I'm sick and tired of doctors saying that i have nothing. I feel like i'm going to pass out. I can't drive. I can't leave the house. My life is a mess. I even went to one the best respiratory hospitals in the U.S., National Jewish - they can't find anything either. I don't know what's going on and i feel worse and worse. I just want to know if anyone is having the same symptoms. Please help.