Hi, may I answer your health queries right now ? Please type your query here...I have rapid heart rate on and off, not sleeping well, very short of breath and have a sensation in my throat right under my thyroid. I do have goiters in my thyroid ..diagnosed 2 yrs. ago. I also have chest pain in the area right above left breast. I am 46 year old female, 104 lbs. 5 1 . After walking up stairs, i get extremely short of breath and pulse races...even to 120 bpm. I did have echo. done (fine) and stress test - did fine but dr. noticed my blood pressure didn t go up like it should after walking. He said my bp is on low side of normal 110/70 - I take it at home and it runs 100/65 alot.