It Started Last Saturday In The Middle Of The Night.

It started last Saturday in the middle of the night. I have been feeling slightly short of breath and anxious. I feel like my heart has been racing a bit, but had a dentist apt. earlier in the week and my blood pressure and pulse rate were fine. (118 over 71) I feel like I need to focus on my breathing at times to keep my heart from racing. When I exercise or exert myself I am sweating more than I normally do. My wife thinks its stress.