Sumitriptan is very good, but in tablet form takes a while to work. A nasal spray version is also available which acts a lot quicker.
Only side effects I get are tiredness and for some reason a stiff neck
I do sympathise, I suffer from Acute Cluster Headaches which are not migraines, but are extremely painful so know how debilitating headaches can be
As mentioned best to get a scrip otherwise its very pricy and not even sure you can buy the spray over the counter
Cluster headaches are an entirely different matter and hard to get diagnosed unless the GP is familiar with them
Drooping eye,congested nose,pain in jaw/teeth and side of face followed by what can only be described as a red hot thing stuck in your eye and into your brain. During this time you are unable to sit or lie down and become very agitated doing such irrational things such as keep drinking water or brushing of teeth, who knows why?
Treatments include strong drugs that are used to treat epilepsy,manic depression and heart murmur, all of which have nasty side effects
Worst comment you can hear is I know how you feel, I get Migraines 🙂
An earlier poster who said he had "Cluster Migraines" might be a bit confused between the two and the symptoms sounded more like Migraine than CH. Can't actually tell when an attack is coming apart from what is known as the shadows which is a weird lesser headache
Good luck and give the Imigran a go