Excessive

I surprisingly did not wake up with a headache this morning, something that doesn't happen as often as I'd like. Lately I've been waking up with very intense sinus headaches (at least I think it's sinus headaches, how would i know?). I'm sure it's related to a nasal spray I've been using for the last few months, but it's always hard to tell, and difficult to know if I should stop using it.