Getting help.

Why is it so hard to get help for PPD? I called my Doctor and all they could do was give me a number for a organization that might be able to help. I called them and they can't get me in to be seen for almost a month. I have PTSD and a history of self harm and suicide attempts. Nothing in many years but the more depressed I get the more those urges are coming back. Any suggestions on how to get help before it's too late?