Hi Op, sorry to hear you are struggling. I havent read all the posts, so apologies if i repeat/contradict other posters. This is just what works, and has seemed to work in the past for me, its still work in progress though, and some things that work sometimes dont work others so this is by no means a one size fits all solution.
First, three meals a day with 5 or more portions of fruit and veg. This is on top of anything you comfort eat with, and/or even if you REALLY dont feel like it. Dont mask your feelings by not eating at all/not eating properly. This leads to more problems down the line. Also add to this with fish oils and multivitamins.
Look after yourself, bath or shower and clean clothes/pjamas, even if you are simply spending the day in bed. And dont be hard on yourself about doing that once or twice. Sometimes we need to indulge the do nothing feeling for a day or two to get it out of your system, but any longer than that and i would suggest getting doctors appointment.
Arrange a meet up with a friend, something you can really look forward to, whatever your thing is; cinema, pub, meal, take away, chat. I know it takes a lot to do this, and you will feel like canceling, but try to push through and do it. It can clear the air for a bit, and stop you becoming reculsive and loosing more self esteem.
Meditate, i havent really been very good about doing this, but in recent bouts of deeression when i was lying in bed doing nothing i stated just trying to block out thoughts and the world, and it seemed to help. I need to stat putting time aside to do this regularly.
Some people find excersice helps, i really dont, but it might be worth a try for you.
NHS stress course was good, maybe see if there are a few round you and book in, deals more with anxiety though, but a bit about dperession.
Try to make some lists if you feel up to it, things like recipes you want to try, books you want to read, adventures you want to have etc. It can seem blank at first but if you try and focus on things you might have though in the past, things that used to make you excited and then think about how this might be different now, and the person you want to be and life you want to have in the future it can help to distract your mind for a while.
Watch easily followable tv shows like cop dramas, soaps and documentaries, that way if your mind wanders you dont have to give up on them. I tried watching films when i was ill and just wouldnt follow them and end up turning them off and sitting there doing nothing, but things like soaps and dramas that were very easy to follow served as a good distraction, same with books and magazines, sometimes you need the light and fluffy to bring you out of your depression.
Last one, a controvtial one, i used 5htp capsuals and they REALLY helped me. But it hasnt been clinically tested, and some people think it may be unsafe (although there is no proof of thi). For me its a last resort, but it does work. If you do use it start off at a low dose and work up. You can get it in holland and barrett or off the internet.
All of this is hard to do whilst working and with kids, in order to get better sometimes it is neccessary to sign off sick for a bit, take time off and ask for help.
Sorry for rushed post, and spelling mistakes.
Hope some of this helps.