Yes, the blood vessels can enlarge to a point of causing pressure on the brain and/or nerves and headaches. There could also be something else going on.
This is something that can and should be checked out by a nuerologist and/or CT scan...among other tests.
I, myself, suffer from a chemical brain injury... caused by toxic exposure while I was in the military. It causes extreme head pain caused by accute and chronic sinusitus, and I tried Topomax with NO relief at all.
Nuerontin, on the otherhand, provided pretty good results for my chronic and severe headaches...but I had breakthrough pain after 6 months of stable doses at 900 mg. per day. I worked up to that amount from 300 mg. per day at first. And I understand that I could have gone up in dosage...but I have now found relief in treating the chronic sinustis with steroids, allergy, and pain medications better than straight, chronic pain meds.
The reason I tell you all this is because I hope you will seek further information from a neurologist to find the root cause of the headaches...and possibly better solutions to your pain.
Good Luck! And please click the green ' ACCEPT ' button for my efforts to assist you...OR...
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