Yes, just call your local VA medical center and they will help you.
I already have a VA primary care provider, can I talk to him?
Of course. You can talk to him about your substance use. Your provider can help you get screened for substance use problems and related issues like PTSD or depression and can offer treatment and support as needed.
I have to admit, all this substance use made me a little broke. I might not be able to pay my mortgage. What if I'm at the risk of becoming homeless? What then?