Due to an insurance change, my original therapist pawned me to another. What is it like when starting with a new therapist?

I don't understand any of this mental health treatment. I have had severe anxiety for weeks leading to this upcoming appointment.

Out of my family, why did I have to be the one to wind up so screwed up?

And now for my most serious question, with my diagnosis in my middle age, can I get well enough to even remotely acquire a "life", or am I destined to live out the rest of my days with bouts of swinging, depression, mania, paranoia, confusion, and feeling out of place on this planet with no reason to continue to exist?

Oh, please respond with factual based details rather than warm and fuzzy feel good details.
I'm not like the gents in the movie A Few Good Men because I can handle the truth.