question: hi ive been diagnosed with over active thyroid and been given carbizamol and propronolol ive been taking them for nearly a year now and doing really well until 2 months ago a started getting breathing problems even without doing any excercise could it be the propronolol as ive just taken one and within 15 mins had shortness of breath and a little tightness in the throat and what can i do if it is im very worried any quick cure to start breathing normal again in an emergency