Severe anxiety.

Hi
Reaching out for advice, from anyone who may have been in a similar spot. I know I need to see a therapist, but how do I cope with this in the mean time.My daughters are all of legal age and out clubbing.They have been a few times , but my youngest has only ever been with me( wanted to try clubbing with me before going out with friends)
Bit of a back story , I have two older girls, one of whom was drugged and gang raped when out with friends(it wasn't her friends, they went to another club, she didn't want to go and wanted to go home, they left instead of walking her to the car, whilst she finished her drink.
Fast forward to most recent days, when my 20 year old has been out, I can't sleep, heart racing, feeling nauseas, tonight both my younger two are going out without me. I am a mess. I can't breathe, I feel physically ill. My anxiety is through the roof and I know I am not going to be a be able to sleep. I am t trying to find ways to reduce my anxiety. We have a plan in place for them to check in once or twice and check in if they are going to a different club. I am taking them and picking them up when I am done. They know they can call me whenever they need or want no matter the time. How do I cope with this. How do I stop this feeling of feeling physically Ill and not sleeping.