Having therapy for OCD/emetophobia and I'm feeing sick - help!

[StrangeSenseOfCalm]

I'm on 200mg of sertraline and have been having ERP therapy for emetophobia since the start of the year. Things have been going well, but tonight I'm feeling really sick and I don't know what to do. To put it in context, the last time I vomited was probably about 10 years ago, and I've had SO MANY compulsions in place to try to reduce the risk of becoming unwell/sick, which I've had to gradually reduce over the course of this therapy. So I haven't felt sick for years, and it's awful.

Stupidly I hadn't discussed with my therapist what to do if this happened, and I'm feeling anxious and scared and alone and just want this nausea to go away.

What’s interesting to me is that the last few times I’ve been sick, I’ve not had that horrid nausea that I sometimes get when I don’t actually throw up.
Generally when I do throw up, the feeling before hand is more of a ‘something isn’t quite right’ and then boom, I vomit with very little warning.

The dreadful nausea feeling I get, I’m rarely actually sick when I feel like that. So I try to remind myself of that. For me, vomiting is quite an unexpected thing that happens when I’m not really sure what I’m feeling like!

Also autistic!