Dull headache for 7 days after Aura

Hello all, It all started 6 days before while doing lunch in office suddenly a rainbow type multicolor flashes appeared and with time it increases this is first time I see in life I got panic and rushed to home and sleep for an hour after that I becomes normal. After that I check with Eye specialist she said everythng is normal in eye possible its an migraine. I do have migraine pain before but this visual disturbances comes in life for first time. Since that evening I have dull headache in forehead and some times in back head which comes and go occasionally nausea. Some times I feel completely OK and some times this dull headache bothers me. I had been to NEURO he said we will wait for another month he prescribed me Vitamins tablets and asked me to come after a month. Well Thanks for this Forum I feel like I am not alone if anyone have this dull headache symptoms which comes and goes please suggest me any other remedies may be some thing is triggering me which I couldn't able to find out ....