The past two days my resting hr has been between 50-57, it's usually in the 60s or 70s, I have woke up in a panic at night?

Slow heart rate. Depending on your age, a heart rate in the 50s-60s, is actually very healthy. It commonly occurs in people who are physically fit. There is an old adage which says you only get a certain number of heart beats in your lifetime, so the slower the pulse the better. It can be a problem, particularly in older people, is when the rate becomes so slow that you feel faint, usually when the hr is < 50.