I have had lower back surgery twice for ruptured discs, if you start feeling pain go down one of your legs or have numbness in your toes seek medical help immediately. For strains stretching is an excellent way to relieve muscle spasms, also I use a TENS unit. This is a small electrical unit with gel covered electrodes that you place on the injured area. It basically stimulates circulation and eases severe muscle spasms by blocking nerve messages to the muscle group. Keep in mind these do not work on major injuries. I purchased one from a medical supply company for $90, they are great to use on all parts of the body except around the head. Good luck, I would not wish severe back pain on my worst enemy, it changes your whole life.