Thanks for query HCM.Severe pain
indicates some musculoskalatal involvement.
Continue you medicine will be helpful to subside severe pain.
Also apply nsaid
Calcium,b12,minerals supplement will be helpful.
Go for certain investigations like cbc,rbs,b12,d3,calcium.
X-ray lower lumber region to rule out any nerve
Doppler study of leg to rule out any deep vein thrombosis
Consult your doctor for proper diagnosis and better medical management.