I get random shocks in my lower back (usually the right side, but now the left) that are quite painful (8-10 pain level), and usually occur when I am sitting. They only last a second or two but the frquency has increased-I have had 4 today when I used to get them maybe once a month if that-They started in December 2008. I usually feel weak and tired after one occurs and have kinda passed out after a shock. Can you help me-I want to know how to stop them, whats causing them.