Talk to Internal Medicine on Legs Pain In Night/During Sleep

Male 31 years old married Hepatitis B but inactive legs cramping in Night/Sleep time in childhood and then gone away for a decade and now again feeling severe pain in legs while.sleeping itna pain k puri rat neend nhi aati or aa bhi jaey to jag jata hun pain ki waja sy, during physical activity mild tiredness hoti hai but legs pain itna nhi hota. Long sitting nhi kr skta office men taangy straight table pr rakhni prti hen jahan moqa mily dil krta hai lait jany ko Khana peena theek hai HB normal hai. which dept of doctor should i consult or what tests are required?