95/65 is not low BP, it is perfectly fine, and if you are fit, a RHR of 50 is fine too, I am 48 and mine is about 55. I ride with a 40 yr old athlete whose is in the 30s. Do you eat properly? Do you sleep properly? Go for a checkup. Look at your diet, look at your lifestyle. If you eat a crappy cheap diet, it feels like your description. Check your blood sugar, do a random and a starved (you are bound to know someone with a machine) to check that.