Hubby stuck in a rutt and don't know how to help him?

Hi IM's, hubby and I have been together for 6 years but married for 3. We have 2 beautiful children aged 1 and 2. Our son is Autistic which makes things especially hard. Hubby works afternoon shifts Sunday to Thursday. He starts at 1:30pm and works until about 8-9pm (depending when his job is done) he doesn't earn great money, but then he has also said he doesn't work that hard and half of his shift is spent standing around. I usually have the kids all day and they come to work with me as well as currently in my small country town their are no daycare vacancies. I usually stay up and wait for my hubby when he finishes work as I am sure most wives would do, every single night I always ask him if he wants me to make a late dinner so we can eat together. Every time he says no, and will come home and make his own food which I think is a waste as their is usually left overs from what the kids and I have eaten for dinner. His dinner usually consists of something he has deep fried. No vegetables, nothing with any form of nutritional value to it. We usually stay up and watch a bit of TV, but I will usually go to bed around 9:30-10pm and he will stay up and finish watching TV. This would normally not bother me except he stays up until past midnight, then showers and will come to bed and spend another hour or so looking at Facebook on his phone. So it's usually 2am before he goes to sleep. Then come morning, I have to get up with the kids at 6am and like typical toddlers they are not quiet and my husband always complains that he is tired because he never gets enough sleep. I have told him so many times that of he didn't stay awake until the early hours of the morning he would get his required amount of sleep. But he just doesn't listen, and still does it night after night. Recently he has been really moody and it has affected our marriage. He can go all day without even saying 2 words to me whilst I am trying to have a conversation. I finally managed to get it out of him what his problem was and he said he was unhappy in his job. We sat down and had a conversation about it and we came to the agreement that he would quit his job and he would focus on doing something that he really wants to do (disability work) I knew money would be tight but my work had picked up so we would have been able to manage and make some compromises. He gave his 2 weeks notice at his employment and continued to enquire about courses and apply for jobs. I don't know weather he thought it was going to be easy or what, he got into one course, but after doing it for two days decided it was too hard and quit and after a few rejections from jobs he was applying for he lost interest and decided he didn't want to do that anymore and decided he wanted his old job back. So on his last Friday at work he spoke to his boss and got his old job back. He decided to have this week off as he hasn't had a holiday for a long time and I thought this would be a great time to work on us. But since Saturday he has gone back to being mopey, I still have the kids whilst I'm working, I've been sick with the flu for 2 weeks now and he still persisted in staying in bed all morning and then watch TV all day. Fair enough he has vacuumed and mopped once and cooked dinner once and last night bathed and fed the kids for me whilst I was out looking for our dog. I thanked him profusely so he knew I appreciated him. But still, i am sick of this moodiness, the mood swings,
Lack of compassion and emotion. I feel as though I am walking on eggshells recently. I am trying to be a supportive wife and not nag at him all the time but it's getting to the point where I am burning out taking the grunt of this relationship. We don't fight, and when I try to talk to him about my issues he just avoids it and doesn't respond. He just doesn't say anything. We went for a 1.5 hour drive yesterday to visit family and he didn't say a word to me and when I asked him why, he said he has nothing to say. And that was the end of that conversation. He is very much an introvert and lacks a lot of self confidence. I have tried to tell him to go to counselling and he went once and decided he didn't want to go anymore. I just don't know what to do, our relationship is getting strained and I love him so much, I just hate seeing him like this, I just want to help him get happy again and I don't know how to do it?