Hi Sophie,
You could try the Search Feature . I just tried it after reading your post here. Maybe someone from RSD/CRPS might be able to help.

I ran some searches for you in PubMed as well but couldn't find anything particularly applicable. However, the one old thread in RSD/CRPS forum does mention "too much irritation in her nasal passages" in Post Number 10 and also trouble with nostrils in Post Number 6.

CRPS - Intranasal KETAMINE -Benefits/Risks?