I have been getting completely random shockingly painful like tingling pain on my right hamstring, located on the hamstring but just above -behind the knee. The discomfort I can describe as like someone stuck me with a needle in my vein. It s enough to require me to grab at my (painful area). It doesn t last long but comes and goes. This has been going on for about a month and a half or so. It can occur while I am driving, while I am sitting still, laying in bed, or while standing, walking etc. nothing specific seems to be targeted.