Calcium and
Vitamin D deficiency can cause muscle weakness, cramping pain, bone pain, Drowsiness, lethargy, hair fall etc.
Take diet rich in vitamin d like egg fish etc
Take supplements like Uprise D3 60k cap once a week for 8 weeks.
Sit in the sun thrice a week for 15-20 minutes
Take plenty of fluids. Keep yourself hydrated
Regularise sleep for 6 hours
Regular exercise atleast for 30 minutes.
Take plenty of fruits and green vegetables.
Everything will be fine. Nothing to worry.
Consult under Practo in case of emergency