Your symptoms are very diffuse and so very difficult to say anything unless and until you are investigated thoroughly.Please get following investigations done
CBC,BLOOD SUGAR FASTING AND PP,LIPID PROFILE
FUNCTION TESTS,THYROID FUNCTION TESTS
,VIT D and VIT B12.
Once these basic tests are done,only then we may be able to proceed further.
In the mean time take injectable VIT B 12 on alternate days for at least 7 injections and see the response.