Please get your husband to a neurologist as soon as possible (likely will need a referral from his primary care doctor. Falling and pain is showing something is wrong. It also carries with it the danger of injuries. We don't want your husband to potentially get laid up with a broken hip or something!
In addition to determining if there is a neurological cause of the pain and the falling down, because peripheral vascular disease (where blood vessels in the legs clog up with plaque build up) can cause pain, please see if he can get a lipid panel to check on his triglycerides and bad cholesterol levels and if those come back high, get doppler testing ordered to check circulation in his legs. And also, ask if a blood test of potassium would be the right thing to do too, since low potassium can cause leg cramps, amongst other things.
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