get a wet rag and put it in the microwave and heat it up and then wrap it in a dry tag so it doesn't burn you and that will be the same as a heating pad. oh ring the rag out before putting it in the microwave

@dennisbaby, I don't have a heating pad but the pillow is the only thing that keeps me from going crazy.

And I sleep with a pillow between my legs

Heating pad is a lifesaver