Thank you for the questions. It seems you may have some other pathology instead of just a simple nerve problem (which was why neuroforte and vitamin B was given to you).
There can be various reasons for the symptoms in the heel and back of the ankle, including Achilles’ tendinitis, bone spurs, plantar fasciitis etc. Nerve compression problems in the heel and posterior ankle are rare, but that would be important to exclude as well.
It would be good to visit a foot & ankle Orthopaedic Surgeon, so that a thorough examination and relevant radiological investigations can be done to identify the cause of the problem. Appropriate management can then be instituted to treat the problem.
Best regards
Dr Sean Ng