Any advice on migraines?

[Moomin]

My brother is staying with us after being very ill abroad and having an operation to do with his liver. He's had a headache for 2 days now which he says is making him sick as it's stopped him sleeping. It sounds like a migraine to me but I've no experience of them. I've told him he needs to tell the nurse who he sees every day about his dressing (he's going in the next hour) but he says there's no point as they can't do anything for headaches (ever the optimist!)
All I've said is that he should lie down in the dark in his room as I really don't know what else to suggest. I feel a bit helpless! Any other suggestions?

Moomin - glad things are easing

Just to add one of my causes-Dehydration.
I also have low blood sugar, and allergies.
I take ibruprofen+paracetamol at the mo but after a few months I have to change meds as they stop working.

Something cool on the forehead + lie down in a dark room. only things that works for me unless its caught early enough with tablets.

Full Fat Coke is also a mega cure for a hangover by the way