Mel, Although you may not feel anxious about anything, the anxiety or panic attacks symptoms really include shortness of breath. This should be taken just as a name for a bunch of symptoms, not really telling you that something is wrong with your personality. It is a problem of neurotransmitters levels in brain, and overacidity, caused by stress and some diets. But I did not have the thyroid problem. Antidepressants are not a good solution.
SR can help, although it takes time.
That is the first thing one needs to do to get the energy to start doing stuff for yourself. I am VERY glad to hear that you are doing wellness. Let us know how you do.