I would say call him anyway... my T and I are no contact as well but in times of crisis he has been more flexible, since he knows I have no support system in real life.
In the mean time, I would promise myself that if he doesn't answer or doesn't return the call/text/email in x amount of time, I would call a crisis line or go to hospital, whichever seems safer.

And perhaps schedule a call with a friend or anyone really, not to say anything intimate or important if you don't want, but just to check in and distract yourself. Run some errands, eat something, take a shower, wash dishes, tire yourself out.

And we are here too