Heavy head and sneezy. My productivity.

I had constant headache for a week last year. it repeated few times. this year 2 months ago I had severe headache for more than 1 week and noticed no sensation to a side of face. Doctor suggested it was migraine attack. I took imol plus for three days. then again after a month I faced same headache with heavy head. If I was moving head to left or right or down I was having feeling like something heavy is moving in my head to downward. felt like some weight is getting added to my head. I took imol plus and I was fine. I faced this 2-3 times from month of March. now from last 2 weeks I was having sneezy sensation in my nose and around too. Feeling like something is wrong in head. not feeling free as before. as Doctor suggested I am taking vitamin b 12 tabs. please suggest what needs to be done. it's affecting my productivity.