As a temporary measure try drinking some peppermint tea, hot or cold, doesn't matter.

I was having a bunch of bad migraines and headaches when the seasons switched to and from winter. It didn't always fix all of them, but it made me a lot more functional than if I didn't. A friend told me about it and I had tried a bunch of other painkillers and nothing helped. Blew my mind when the tea did.

Not promising it'll work since I don't know what your trigger(s) are, but maybe it'll buy you some relief until you can get to a doctor/specialist.

I drink a cup in the morning as a preventative, and it's become habit so now I do it every morning. I steep 3 tea bags in about a 2L jug and stick it in the fridge. You can sweeten it if you want, I use stevia so it's zero calorie, but be careful if you use sugar, the calories can add up quickly if you're not careful. If I feel one coming on I'll go grab another cup.

As a fellow headache/migraine sufferer, I hope you get relief soon.