welcome to HCM
first of all if you are a smoker, try to avoid it.avoi coffee.
do a serum B 12 assy. also a routine blood test
if the tests are not normal then consult your doctor for further action.
take a lot of water, lime, fruit juice.
in between works try to move your legs and do some sitting excercises.
you can take some multivitamins like B complex for 15 to 2o days.