I am 73 years of age and currently in Abu Dhabi working, recently I have started suffering cramp in my lower legs at night. Last night I had a severe pain from inside upper left leg near my groin this pain lasted for about 4 minutes during which time I could not straighten my leg, any clues do I need to worry?

If it happens nightly I would get it checked out. I don't think it is anything serious but I don't have nearly enough information or access to make a firm diagnosis. The safest is to get it checked out.