2 days back i got a lower back spasm when i went to sit on the floor from standing position. i took diclofenac , which subsided the pain but when i try to sit up straight i experience a little pain in lower back and start feeling dizzy. what should i do ?

Low back pain: Low back pain is extremely common and can be caused with relatively routine activities. The good thing is that it usually resolves on its own. The diclofenac is a good start. Go online and look up McKenzie exercises and add those to your daily routine. If your symptoms persist for more than 6 weeks you may want to get an MRI. Chances are that this is more muscular in origin.