I just thought I'd add this
There are some migraines which relieve themselves once you are sick - I have no idea why this is though.
I used to get migraines through travel sickness, and once I had been sick the migraine would magically go.
Cluster headaches usually start around the eye and are like an ice pick being shoved into your eyeball (they aren't called 'suicide headaches' for nothing..
) the pain is one sided, unbearable and isn't relieved by painkillers or vomiting (I have CH and the only thing that relieves them are Triptan injections) they can last a few days but then you can go months or years until the next 'cluster'. Mine are usually triggered by Hormones and usually happen for 3 days after my period every month.
When I was diagnosed many years ago with CH I was told by the Neurologist that women didn't get them, they were a man thing! This is rubbish, but some GPs still follow this outdated notion...
If your migraines change, or become unbearable then mention possible Cluster headaches to the GP, when my GP mentioned them to me she also said that if they were 'true' CH then the Triptan injection would work, if it didn't work then they were migraines. My first CH after this I took the injection and within 10 minutes I had gone from lying immobile on the bed fearing my head was going to explode to dancing around the room with pure joy!
Migraines and Cluster headaches are often thought of as 'just' bad headaches by people who don't suffer from them, when they aren't, they are debilitating and in my case life limiting until I got the correct diagnosis and treatment.
xx