Re: involuntary twitching of limbs-cause?
Maybe low potassium, magnesium deficiency and/or dehydration from the long drives. Stress, stomach pills (prilosec, pepcid etc) can cause magnesium deficency. Your doctor can check his electrolyte balance to see if there are any problems.
There is a medical term, Benign Fasciculation Syndrome, that doctors use when they don't know the exact cause of muscle twitching.