I'm currently at home sick because I was badly cramped up and couldn't even move my head and arms a few days ago, and my doctor prescribed me anti-inflammatory pain meds and heat, especially most heat. Hot shower/bath or even a wet hot towel wrapped around my shoulders.

I'm usually in pain after work, because it involves mostly heavy lifting, as well. I try to rest as much as possible, go to sleep early to relax my muscles. Sometimes I take an electric heating pad into bed, too.