Do you have a friend who could go to spin class with you or ride with you? Sometimes simply having someone around to motivate you is the best medicine. Keep your appoint and be honest with your doctor. Do you see a counselor? Talking to someone totally removed from the situation is often very helpful. Do you have any pets? How about taking the dog for a walk on a daily basis? No dog, how about you borrow a friend's and ask permission to walk it each day.

Hang in there!