Undiagnosed symptoms now diagnosed

I suffered from allergies to foods, but also to solvents including body care products for several years. There is no treatment, only avoidance and masks, but now, reacting to face masks too.

For several years, I was told these were allergies. A few weeks ago, an NHS Consultant diagnosed with Multiple Chemical Sensitivities, which they use to treat, but no longer, its been axed.

If I put MCS on the list of diagnosis, will this count as a change in circumstance even though I suffered with the same for several years?

Same question for hypertension, which I was not told till recently...

Many thanks.

Thank you, will do