I am a 57 yr old male and over the last 3 years have developed numerous symptoms my doctor(s) are unable to explain. the few i am most concerned about do affect my functionality: memory, slow thinking, exercise intolerance, resting pulse 48, one eye out o

See a doctor: It looks like your heart maybe responsible for all the symptoms you're describing and you should see a physician within few days. You want to know what made your heart going too slow.

?thyroid: Slow mem, low exercise tolerance and low resting pulse w/ ?Eye sxs, could be multiple things, but one not to be missed is low thyroid. Since multiple physicians have seen you, I am sure your thyroid has been checked. Normal values are changing. Tsh should be between 1-2.5. The higher the tsh, w/ lo t4, the more hypothyroid one is. Rx is thyroid hormone replacement.