What Causes Low Blood Sugar Level And Headaches?

yes 2 weeks ago this sunday my sugar dropped and i have been havin issues with low sugar.but after this episode i developed a headache which turned into a migraine.i finally gave in and went to the er.they done a ct scan on my head and the dr said that they saw something that they described it to me said its like tonsilitis but its on the back side of my cerebellum which could possibly cause migraines.they gave me a shot for pain and meds it didnt help much.they told me to ask my pcp to set up a mri and see a neuroligist.my dr did so im waiting on mri and to see a neuroligist.my head is not hurting as bad as the first 3 or 4 days but has not gone away completely ive noticed a difference in my speech at times,sight,balance,thinkin skills,sensitive to sound light i also notice at times i have a sensation on different places on my head,it reminds me if u have like a small piece of glass in ur skin and something rubs it it reminds me of that type of sensation.i noticesometimes that i cant get comfrotable and cant be still and sensitivity on different parts of body.any idea what this is ?