Hello
I know how you feel, i've suffered from depression for many years, and while I took medication for it you don't need to!

Firstly, your hormones will be driving you absolutely crazy, it happens to all of us! It may seem obvious but when you're feeling low you don't realise how important it is so... Make sure you rest! Sleep when you can. Get DH to keep your DS occupied on weekend mornings so you can get a big sleep in, go to bed early etc etc. Eating lots of healthy food is always a good idea, but drinking lots of water helped me most.

But i think the most important thing is to go easy on yourself. Don't put pressure on yourself to be completely happy all the time, your allowed to get tired and irritable! Do something fun for yourself, too. Whatever it is that makes you happy to do whether it's sitting down having a movie marathon or going for a walk through the park, just do it!

Have you got a good support network? Talk to them until you can't talk anymore. Getting everything off your chest can work wonders, or even just chatting about things you like, what's happening in the world etc. Surround yourself with people who make you feel good!

I hope that helps and that you're feeling better soon!