would it be bad if i used a heating pad?
Not at all! I don't think they get hot enough to alter your body temp significantly...the only time it would be a problem is if it was hot enough to cause your temp to elevate so much that it caused your blood pressure to rise...but that really only happens with saunas and jacuzzis...so no worries.
After my TL, I had cramps so bad I would need to stay in BED! It was awful and all the Tylenol in the world didn't touch it. My AF was also extremely heavy...my TR doctor said that having the reversal would help with all that...and so far, he is RIGHT! After that first cycle from h-e-double hockey sticks, they have been so much BETTER!