Hi there
Although not diagnosed, I do relate alot to this.
I occasionally feel an urge, if that's the right word, to become something.
I find out about it and see myself as that identity. It'absolutely real to me when it happens, and I have never felt happy with who I am.
Currently it's religion. I neeed to 'become ' part of and follow a framework for living, or I feel empty of meaning.
Like you I struggle with the 'good' and 'bad' voices, and with opposing thoughts and ideas within a short space. It fels out of control sometimes and leads to spending money I shoudn't.
I don't know what my problem is, but I know I have one.