I feel your pain too. I always worry that one day my T will not be available 24/7 for phone coaching. I am very careful not to call unless I REALLY need to so she doesn't think i am too dependent on her. But, just knowing she is there when i need her is a big thing for me, even if I never need to call. So I can understand how this change must feel for you.
You can still call for coaching right? It will just be a different T on call every week. This could be an opportunity to get to know the other Ts too and have more people involved in your support system. I know it's not the same though. Changes are so hard.