Acceptance. This is a hard illness to live with since there are a lot of environmental barriers.
Validate yourself and your experiences.
Study yourself -- what you are exposed to and what you put into your body.
Resilience! -- DON'T QUIT. Keep searching for your own answers and for what works for you.
Try things more than once. Allow things to offgas awhile, for example, and then try again.
Change what needs changing: your home, your social circle, your products.
Develop prevention, decontamination, mitigation and remediated protocols. Learn to get chemicals out of new and used clothing and linens with powdered milk, airing them out.
Ask 1x guests to wear chemical safety suits, garbage bags, plastic shower caps or plastic single-use rain ponchos.
Ask friends and family (who see you regularly) to use safe products and to decontaminate their clothing before agreeing to meet in person or inviting them into your home. Maybe they can have one set of clothing that is decontaminated that they can change into for your visit together. (I ask my people to leave theirs at my home. I decontaminate it for them and then we leave it here at my house to help protect it from future decontamination.)
Commune with people who care about you and who are willing to accommodate.
Commune with other people who also have sensitivities.
Fight for your human and civil rights, but pick your battles wisely.
Remember that health is the first form of wealth and that EVERYONE deserves health, safety and dignity.
KEEP MOVING. KEEP TRYING.