Poor strength in both legs. Now 64 kg!

Problem started with tickling in foot and after a year or do when this phenomenon increased we got it checked with the neuro doctor in kota. MRI was done& he diagnosed of few nerves around spine is getting pressure and as adviced operation is only the treatment. Then v consulted another neuro doctor in azamgarh he advised exercise of stressing neck. It worked for few months. Thereafter similar symptoms than he started taking neuro medicines which gave him good sleep and some relief on the earlier problem. Early morning walk continued during the entire period, but as time passed msy be around a year he started loosing slight control and power in his legs and walking distance reduced but continued regularly. Just recently he feels very less power in his one of the legs pls suggest suitably. He is 75 years now 64 kg