PP at its highest

Just need to vent ; I'm 3 weeks pp and it's really starting to hit me. I been diagnosed with bp depression since I was a little kid with anxiety disorder with ptsd and being a new mom everything is 10000x worse. About a week or 2 after being home pp really started to set in. Visitors come to see my son but stay for a couple minutes and then leave to socialize with my fiance for the remainder of the time. I feel so alone because none of my friends want to sit with me because im not "pleasant" or I'm with the baby all the time. I'm overly stressed and yes I'm irritable all the time from lack of sleep and trying to adjust to the new mom life. I cry over the littlest things like not having someone to go for a slight walk with me outside. I see my dr for my meds in a few days but I'm depressed and dont feel like myself. It's me myself and my son majority of the time so I feel like shit that I'm depressed when I'm here raising my son and making my anxiety worse like I'm not doing a good enough job. I tell myself everyday I got this and try to stay positive but the PP is making it very difficult to relax and enjoy the little things.