you should try electric muscle stimulation. Muscle Stim pads worked wonders for me. my whole lower back was locked up for months before i finally went to a chiropractor. finally moving and twisting again. i have a huge back spasm two weeks ago, i took out the EMS she have me and cranked it up, boom two days all better. just make sure you're set at the correct frequency or it will do nothing. do you have a chiropractor you trust? my other suggestion in MOIST heat. dry heating packs will actually draw moisture out on the muscle making it worse. Get a wet towel (well, ring it out so its not dripping) fold it up and pop it into the microwave for 30 to 45 seconds, them pop it on the aggravated spot.