It's great that you can post here. It sounds like it might be just what you need.

Maltesers just not cutting it as a coping strategy anymore?

The most important thing I found was to tell people out loud what you need. SO if you have to go to, say, a night out, call a friend who'll be there ahead of time and say "this is what's happened, it means that I might need.... [time outside sometimes/you to change the subject away from babies for me/your support when I leave early/whatever]" Your DH will be able to help with this too. I found that most times, just knowing I had someone on my side, who could back me up was like an escape hatch, and all the stress just melted away. The burden was shared, I guess.

Tell people if they're not being helpful. Like your MIL. Say "that's not helping." Because if you don't tell them, they won't know.

And do try to get out and about. Sunshine is great for you.