Hi Heather,
Came upon your post.
I'm assuming that you might be on SSRIs to help cope with your CPTSD?
If that's the case, they will make you hypersensitive to the sun, to the point of feeling weak and irritable.
As mentioned by other Permies, if you add grapefruit or most citrus on top of that, you're compounding the effect.
I would double-check if any of your skin care products contain any of the ingredients mentioned.
Hope it helps!
-Mat