Thanks for query on HCM.
Regular follow up is must for diabetes
check up because of strong family history.
Pain from back to leg indicates some neurological involvement at lumber level.
Go for x-ray lumber,cbc,fbs,ppbs,s.b12. Also rule out deep vein involvement by Doppler study.
Start b12,folic acid
to subside the pain.
Avoid any exercise till get complete cure.
Be watchful for sugar level.
Consult your physician for further guidance and medical management.