I have been vaping for about 5 weeks. For the last 3 of those weeeks I have had a terrible, constant headache. I have tried changing juice, eliminating extra menthol, eliminating flavor...I even thought it was a sinus headache for a while and have elininated that possibility. I understand that vaping can be dehydrating, so I am trying to drink a lot of water, but still have a headache. Will lowering the nicotine help? Will VG instead of PG help? I am at my wit's end, I cannot live with a constant headache like this. Help!