restless legs syndrome
it is a common condition, varies in severity and usually no cause can be identifed. Life style changes such as avoiding excessive caffeine, alcohol helps. Avoid drinking tea or coffee in the evening if symtoms are worse at night. Gentle exercise also helps and to drink plenty of water.
Certain medications such as statins for high cholesterol and betta blockers can make symptoms wore.
I would suggest seeing your GP first for an "MOT" blood tests i,e FBC, renal and liver function, B12, folate, thyroid functionand myscle enzymes.
good luck