Thanks for posting on HCM
From your description your mother is suffering from peripheral neuropathy
which can be due to a good number of reasons. It is possible that she could be having a drug reaction or side effect of one of her medications, vitamin b deficiency
, underlying diseases condition such as diabetes
(will need to have been existing for long now), hypertension
, SLE, MS etc. If drugs are not the culprit (only way is to halt one or two of the drugs or investigate further on each of their side effects), then your doctor will need to run some tests to rule out any possible underlying diseases conditions.
Other causes of peripheral neuropathy like Guillain-barry syndrome will need to be excluded too.
Hope this helps