Fragrance/Chemicals/Smoke seems to be my main trigger

Seems to be some kind of mathematical equation for me since around 2019.

Strength of fragrance/chems/smoke x Duration exposed = How long i'll experience migraine symptoms for.
My longest one to date was 9 days of feeling like i had brain damage, flashing lights in vision, slurred speech and very tired and wonky. Ever since i made the link they became less and less so but thats mainly because i avoid fragrance and chemicals.

Im convinced i have Multiple Chemical Sensitivity since 2019 , but im also convinced that fragrance has got stronger since Covid! because most people became nose blind. Its so hard to avoid too have resorted to : Indoor and outdoor clothes (hood up) (Shower as soon as i get in and change into clothes i only wear indoors) , went fragrance free years ago and have to wear a p3 carbon disposable mask when outside or brief visits indoors (the p3 stops smoke, but does nothing for VOCs / Fragrance but does guarantee if it fits well it shouldnt have gaps) the carbon element is only 'nuisance odour' rated.. let me tell you some people are more than a nuisance odour lol and even resorted to wearing a respirator with chemical filters ABEK1 for buses, trains. Interestingly i have suffered with motion sickness my WHOLE life. One of first times on bus wearing my respirator i was like wait wtf, im reading my phone and i dont feel sick at all? whats going on .

Anyone else also fragrance free?