@ShadowPuppets This stage can be really hard when children aren’t sleeping. I’ve been through it and had my DH be made redundant and it’s a bloody hard time.
Without sounding like a ‘live laugh love’ poster I would urge you to find the happiness in each day where you can - seek it out.
Does your 2 year old like to jump in muddy puddles , jump around in piles of leaves - take them out, put a cover on the buggy and do it. Go to the library and sit whilst your toddler explores.
Get out for a daily walk whatever the weather (alone) and put on your favourite podcast.
If money is tight but a body lotion and some pampering stuff, candles etc in lidl /aldi ( it’s actually nice!) and give yourself some time to look after you. Even if it’s only 10 minutes, indulge in it.
These are all some cheap / free things that can lift the spirits. You may need the antidepressants to help, I can’t speak to that, but seeking out joy and happiness makes such a difference. I remember one day someone saying to me ‘you choose your attitude’ and this made all the difference to me. I should add that I am not suggesting this would work for clinical depression or anxiety but it does help for situational sadness and maybe that is what you are experiencing.