This sounds like a really tough post to deal with but I'll try and volunteer a thought all the same. I also hate to try and make any huge assumptions based on such limited information, but hey.
From what you say, I suspect that how you feel about sex is very likely to be a reflection of a much broader issue. Leaving aside how you feel about sex, you say that you won't go to a male cashier, you feel yourself to be unattractive, find it a struggle to be a mum, have some level of obsession (maybe overstating) with children dying, have self harmed and had depression.
You also suggest that you find DH to be dominating, though you don't say to what extent (whether it's simply that he prefers things on his own terms or something more), you're not sure if you love him and that you have a very busy day-to-day life. The entire tone of your posts, if you'll forgive me saying, sounds like you find getting through each day to be pretty tough.
I guess the obvious question is whether you think that you are still suffering from depression, albeit in a slightly different guise to previously. Again, I hate to make assumptions, but from what you describe I'd guess that you almost certainly are.
You may not want to go with formal counselling, but have you considered speaking with your GP? If they're disinterested, ask for a referral to another GP or whether they can at least give you a either information on Community Mental Health Services. If even that makes you uncomfortable, then perhaps speaking (anonymously) with an organisation such as Depression Alliance or The Samaritans may help.
I may be way off the mark here of course but just hoping it helps.