Experiencing electric-like shock in my left arm and left thigh nowadays when sneezing. My internist told me months ago that it was arthritis that was causing it. Yesterday morning while on my knees re-organizing 2 drawers full of computer cables and old phone equipment in the den, I stood up to get something in another room and lost my balance doing so. As a result, I dented a sheet rock in the hallway when I fell over backward. Again, my left thigh was the culprit when it went into a bit of shock and numbness. Any advice will be greatly appreciated. Thank you in advance for your time. Ramon