Completely Lost...Don't know what to do!

first make up your mind, you were becoming a Doctor or an Engineer? these are quite different fields and require different subjects to qualify.

i think if one can get himself to MBBS, they are capable of finishing it off!
and now you are according to you passed one of the toughest exam in Pakistan a became bureaucrat, i dont think you would be suffering from any depression on this regard, as what you tried to do, you made it possible.

well if the issue is a girl or relationship that shouldnt be mixed up with career.