I can relate as I do also have many personalities. I am aware of them. My psychologist told me I had personalites 1 year ago and it crushed me. It took me a while to accept it.
Personalites are dissocotiave states, like blanking out. Sometimes they can be moods, where you are aware of them. They don't always become states where they become they are functioning soley without the knowledge of your other personalites. My main symptom is I seem very moody(according to other people). And it isn't very noticable.
And these personalities also have addictions that try to recreate my trauma. I have a personality of a bloke I had a crush on in Yr 10 that was attacked my my dad that likes to infuritate people. I have a 5 year old that likes to be social and is happy.
I have PTSD and T1diabetes. I am still healthy, insulin is like having a leg, not something I need to solve like my addictions. I got it either from an infection of the pancreas or rogue immunity cells not from my trauma. So I have a very different opinion of this. :( Diabetes means I am eating healthy food, exercising regularly. My diabetes is making me healthy. It is the way I like to see it.
My fil is alchoholic, and I have trouble dealing with it.:(. As it has effected the family a lot. My husband has psychological issues and pain from it. And his liver is shot. However he went through trauma, and I understand where he is coming from. It is the alcholism that I don't like. I love my fil, he is a lovely man.
My worst addiction isn't physical. It is enraging people. It probably makes other people as mad as my fil makes me. As it makes me seek out unhealthy behaviors like unemployment and infuriating people. But the good news is it is improving a lot becasue of all the therapy.
You can resolve personalities. It takes a lot of work. But they can be integrated into your real self. My psycologist calls it "getting the real me to stand up". Be prepared though, the resolving of personalites is quite rough in therapy compared to other councelling I have found. Good luck.