Something that was arranged for my PND mothers group was baby massage, and the partners were able to come in and have lessons too. This really helped me have some down time with DS and seemed to settle him down before bed. Apparently it's also good for fathers since they get to have some one-on-one time with their babies that is (hopefully) calm and enjoyable.

I also used to be terrible at taking my meds. But because my meds make me so tired and wacked out (doctors won't change them because they say at least they're working and I'm not depressed as much), I've had to start taking my doseage at night. So I keep a bottle of water next to my bed with my meds so that I remember to take them every night. Before that I used to have to carry them around with me and set an alarm on my phone so I'd remember to take them at set times during the day. And even then I'd still forget! haha

I never thought to take DS in the shower with me, I wish I had though. I ended up putting him in a bouncer on the bathroom floor just so I could get to have a shower without him screaming because he couldn't see me.

There was also a children & family care centre which ran the PND mothers group who also had a free psychiatrist who let me bring DS with me to every session. Hopefully there is some kind of support system like that near you, if you aren't able to get the support you need from family or friends.

Sorry, I couldn't think of much advice to offer you. I hope things improve for you soon. I know how hard it is to be feeling depressed and having to cope with so many stressors.