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.

Panic would: increase your heart rate, not decrease it. Resting heart rate of 50-57 is good, and suggests maybe you work out a lot or are in good shape from other activity. Panic has, as its first symptom--racing heart and deeper, rapid breathing, along with 31 other symptoms--none of which would be easy to ignore. See a shrink to further examine.