These are all reasonable fears and I don't mean to minimise them. But if we examine them dispassionately, we find that none of them is a conclusive argument in favour of staying with your current T.

Fear 1: What if I start seeing another therapist and it doesn't work?
Is it working now?
Fear 2: What if I'm making a huge mistake by giving up on CBT and/or this therapist?
If you decide you made a mistake, you can come back to CBT. I'm guessing your current T would take you back, too.
Fear 3: I fear opening up to yet another person.
My experience is that opening up gets easier with each new therapist. But it is a pain to have to start again.
Fear 4: What if I won't find someone who understands me?
The more people you try, the better the chance of finding someone who does.
Fear 5: What if no one can help me?
Then you don't lose anything by trying a new T.