I’ve had what feels like a migraine or a tension headache everyday for the last 4 days. The only thing that helps break my headache is ibuprofen 500 mg. However a few hours later my headache returns. I’ve been sleeping enough, drinking water, eating, am a little stressed, and I got off birth control 4 months ago so I’m not on any contraceptive. Should I be worried?

Might be worth checking with your doctor, migraine for more then I day I would say needs to be checked out especially after taking ibuprofen.

I agree with @seechell this sounds pretty serious so seeing a doctor would be best, especially since you’ve been resting and staying hydrated and make sure to eat. Not much more you can do on your end.

I would definitely be seeing a doctor just so you know if it's something serious or not but could be side effects from stopping birth control, sometimes it can last 6-12 months after stopping certain birth control.