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Your case is complicated due to old age and multiple problems. From your description possible causes of your multiple suffering in order of preference:
-Decrease blood supply of lower limbs
and depressive illness causing or increasing complaints
-Anxiety and depressive illness causing or increasing complaints
-Combination of above reasons
Considering multiple possible possibilities you need evaluation by cardiologist, neurologist
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal