Why do I feel emotionally numb???? Whats wrong?

just as the title says... I feel soo emotionally numb... and to b honest, i have no idea why... See, I trace it back to me getting sick back in March.. I had a sinus and inner ear infection, and ever since then, I haven't been the same way.. My creativity in writing music has diminished, nothing really seems to excite me, or make me sad, or anything... And it frustrates me! Cause, I used to be real emotional about alot of things, and now, it's like I feel nothing at all! i have no idea why... I went to the doctors, and everything about me physically is perfectly in check, and all healthy... I used to be depressed for months on end... perhaps, subconsciously, I still feel emotion, but consciously I dont really... Like... I wanna be sad, and dark and foreboding and etc... But I just cant seem to find the same emotion that i used to have 4 months ago... It upsets me sooo friggin much..... Whats wrong?? Is it normal for people to go through emotionless periods of time??