3 strategies work beautifully for me for the exact same type of headache you describe:
1) Butterbur extract capsules/softgels that are "PA (pyrrolizidine alkaloids) free". This planet based medicine has an excellent track record in migraine sufferers, So I read the clinical trials on PubMed (that my research & my board certified Neurologist also suggest) It is recommended that a person take one daily for 3 weeks to experience the maximum benefit, and then will want to continue. Well, one cap a day of Butterbur extract 50mg really worked for me within days. I am very drug sensitive and so I just keep the gel caps handy. But... I find I need them less & less...
2) I'm a little different than you and noticed that heavy/sweaty exercise for long periods was stimulating that kind of headache... this is sometimes called "exercise induced migraine"... so I take a HAMMER brand ENDUROLYTE, just one, to keep my electrolytes balanced. Then every few hours another, if I an working out or in a cycling or running event. With no mineral depletion, I don't develop the headache/migraine. Magnesium supplements alone also work for many, based on the same principle. Your circulating minerals help with fluid balance and reduce tension. So, I think you might want to explore this. Like Butterbur, keeping your electrolytes is harmless (and actually healthful)
3) Topically, massaging hemp oil compounds (which is the totally legal, non-psychoactive form of the pain & inflammation reducing cannabinoid found in the cannabis plant species) on my temple or the area of aches also works very well. I use MARY'S NUTRITIONALS Elite Compound or CHARLOTTE'S WEB BALM.
These three strategies are kept in my toolbox of remedies and I use them as conditions suggest. I like the balms at night, the capsules when active and they will be quickly metabolized. Like you, my brain booger is stable and actually shrunk a bit in the last MRI!!! Really happy about that! Didn't know that was possible
Hope one of my suggestions is helpful and hope you feel great again!!