I think you should approach this one head-on. Ask HIM to recommend someone you can see. Start researching / interviewing.
This man is so important to you because you know him and he knows you! So I think it is time to meet some other people who have potential to know the same.
Even if you never have to switch tp's, I think that seeing who else is out there will help with your fear.
I am so sorry to hear you are facing this. I fear the same thing with my pdoc; he is so important to me as well.
I am certain that if he does not get back, that he will assist you in finding someone who will treat you well. It sounds like he cares a lot. I hope he can recommend someone soon for you b/c you need the therapy. Look out for yourself.
Try not to panic and focus on the care you need.