Persistant unsolved issue. Required?

Hello respected Doctors, I am talking the following tablets Met Xl and nexito10mg since four months, I stopped taking nexito since four days on my own, was facing problems like all time drowsyness, dizziness fatigue etc...but still the same problems are persisting.. when I wake up , its like new beginning like there is not coordination before going to sleep wat I was and after waking up..I remember major things but i forget small things...I am B.tech grad attend 1 hour training class daily But can't concentrate can't analysis can't recollect and can't think more feel difficulties in learning...feel brain is blocked..earlier five months back consulted psych for Ist time was given wrong tabs by psychiatrist and that too heavy dose..I stopped after four days due to developing of very dangerous severe side effects...A week ago done diabetic test(fbs n ppbs) results were on border i.e 101(70-hundred normal).what shall i do? which doctor I need to consult? is mri brain required?