Hi Orchid
It sounds like we're in a very similar boat, though I have only been struggling with anxiety and depression for the past couple of years. But because it came and went I have been able to deal with it quite well.
But like you, suddenly about 6 weeks ago it got much, much worse and the anxiety really increased to the point where I suddenly didn't want to leave the house. These last 6 weeks have been a living Hell that I wouldn't wish on my worst enemy.
Having said that I have forced myself to keep leaving the house, maybe 3-4 times per week but I dread it, and am always very keen to get home again. DH and I went out for lunch on Monday, and yesterday I went with him to his office and did a few hours of filing for him. But I'm just enduring it. And when I get home I realise I am really just walking back into a safe prison 
But, it sounds like you are slowly, but surely improving, and have come quite far in just a couple of weeks. so very well done. I totally get the fear of heading out for the day, even if you have planned to do something really nice. Basically when the anxiety has you in its grip then nothing feels nice, and all you are capable of feeling is a jittery fear and dread.
Today, we're going out for a drive in the country and a picnic. I am dreading it, but will go along with it, and just endure each moment until we can come home again. Though funnily enough, I am quite happy 'safe' in the car, being driven, I just don't like getting out. But I keep forcing myself to go through with it, because my CPN insists it's really important to keep pushing yourself to do it, else I really will end up totally housebound, and then hating myself for it.
I think your DH must love you very much, and that he is only speaking out of frustration and concern for you, rather than genuine annoyance. The fact he has read up about anxiety shows that he is still engaged with you and actively wants to help and understand more. These are not the actions of a husband who doesn't care, or might be on the verge of leaving.
Also, could it be that he was trying a 'short, sharp, shock treatment' in the hope it might snap you out of it? Totally the wrong approach, I know, but he wasn't to know that. My DH has been really lovely and supportive (but it's only been 6 weeks for him) but he tried something similar a couple of weeks ago. Threatened to go and book into a hotel, and leave me to it, and for about half a day just ignored me totally. But when I broke down he realised that I just can't snap myself out of it, and that this is genuine. It was like demanding a person with a broken leg run a half marathon.
I am thinking of you, and keep posting 