Angel - you have four wonderful children, which will be a constant source of joy, pride, love, worry, frustration, exhaustion, stress, oh and joy, pride and love!
I tend to lurk on these threads now, i have just admitted to myself i have had PND and it has taken me two years to get some help. When i read other threads, i think, christ, that woman sounds depressed, she needs help, then i think, bugger, she sounds just like me.
I see you want to be a midwife - is that not something you can work towards? You obviously have little ones at home so it is not something that you could easily do straight away but you could set things up for yourself. I think midwifery is a degree level qualification (im not sure about this) so you may need to boost your qualifications in the mean time. That you can do at evening class, one at a time if that is all you have time for. Of course you could do an access course too, although that is probably geared more towards the time when you have more time. I know that some colleges do this on a part time bases. Talk to someone at your local college, see whats on offer. Just that one positive step may well open out the future to you in a positive way. Of course it is easy for me to preach, i never listen to my own bloody advice. I left school with no qualifications whatsoever, now i have a phd, simply because i started an evening class and got hooked. Now of course all i have to do is actually get a job
I think you should tell your doctor how you are feeling, if i had a constant headache i daresay i would be feeling a little down on the world too.
You have achieved so much (your children) so far, let this just be the begining.