I don’t know what to do anymore

For 20 years I’ve lived with my Bi Polar 1 disorder

cycles all over the place, meds and therapy. I’ve had it all on track and loved the best I could until this last year. I was made redundant after 10 years, moved to Australia 4 years ago, all my family except teenager live 13k miles away, I have always tried to help those who are just starting their mental health journey but lately I feel like a stepping stool or therapist. Some “friends” call me 3-5 times a day over things like a text message, email or playing the “what if game”

they have therapist(s) , meds and coping mechanisms but have decided my life is part of it. I get no real time without feeling like a bad guy for not wanting to hang out because they have no one else. I’ve had so much stress from “home” on top of trying to get another job, raise a teenager, my own mental health issues. Another “friend” who I have been friends with for 30 years, living with my parents to help them help her accidentally butt dialed me while venting to some guy who has never met me and did nothing but talk crap about me helping her.
I’m over people, their problems and no one asking me if I’m ok, because at this point no coping skill I have is helping and less people I can talk to. (I draw, music, clean, I have dogs, I try) I don’t know what else to do. I’m expecting real stress for the first time. I get dizzy and sick and my physical and mental well-being are dwindling. I refuse to take steps backwards in my mental health journey but I just can’t people any more. Any advice?