Hi Jenny...Hyper thyroid can absolutley cause a racing heart and breathlessness. I am not suggesting that you have this as obvioulsy I'm not a doctor but if you end up going to the doc that is the first test I would ask for.
I do not have health insurance either...do you have a county clinic or a place that bases their fees on income where you live? Some cities/towns have clinics run by the United Way that offer services for very little money, or donations. I have gone to them several times.
Feel better and don't let another doctor label you as just anxious without testing you for the obvious.
fibro, menieres disease, RLS, anxiety disorder, disc compression, scoliosis, spinal stenosis TMJ Meds: Lexapro and valium