I have had my times of depression and suggest two possible ways that might help even though they sound the opposite to each other.
Firstly, if you have something you enjoy doing which involves other people, so perhaps sing in a choir or play whist or bridge regularly with a group, this can be very helpful. I was brought up not to let people down, and so there are times when I have no wish at all to do whatever activity. However , I am part of a group and especially something like a choir where the different numbers coming to rehearsal affect the sound, so I go . Often when it is a real struggle to go, I will actually come back in a better state of mind. At the least you have not let others down, and at best you have got some enjoyment that you did not expect. Also if you enjoy driving you could volunteer to drive for the hospital car service or your local community group, so that you are doing something useful, and you also get out and about and have something to talk about with your husband when you get back.
The other thing is within your own time dont be so rigid, try and be open to the day. So especially at this time of year, if the sun is out I ignore personal planned jobs such as housework or a mundane idea and go while the weather is good. There will be enough rainy days to catch up with whatever. It can be just go for a walk, or keep a picnic box in your car at the ready with cutlery and plates and kitchen roll etc. If it is not too far go to the coast and buy fish and chips and sit watching the sea and be part of the scenery.. Or set off with no set plan and something I have done is , when you see a name of a place that is quite intriguing such as a town here in Yorkshire called Wetwang, which I thought was great. Just follow it and go and see what it is like. If it is lovely and unusual great you have a new place to visit. If it is very boring, you cross it off your list and move on.
If you try this, you can do it alone or with your husband. The point is to be a bit freer, not end up looking forward feeling you know exactly how each day will be. That is definitely a way to depress yourself. When you have a good day, you then also have that in your memory, so on other not so good days you can look back on that day and hope for more.
Either of these things will mean that at the end of the day you will feel better, even if it is only not feeling guilty about letting someone down, so that helps and if it goes well you can think about it later on.
Do you get your local paper? I always do, as you see lots of bits and pieces you might have missed. Then there will be things now such as gardens open for charity or afternoon teas for a church fund etc. It does seem as though your husband doesnt have much idea for himself and looks to you for plans etc and you feel that is a burden and resent it and probably wish he would come up with some ideas. Is there a mens shed in your area? There are a lot springing up. Round here they have one and it lets the men meet up and they do a variety of things, mending tools and things and helping local charities, besides giving them a place to go and meet and make new friends. The latest thing here is they have just made some lovely deep planters to go in a garden of a church. Something like this might interest him.
Lastly is there something you used to do, but no longer do, or have always wanted to do and not tried it? So, perhaps you have always wondered about watercolours or something. Look around and I am sure you will see a course somewhere for a time , or a weekend away doing creative writing or whatever and GO. If you love it you will want to carry on in some way. If it didnt turn out as you thought at least you had a go.
There are many things I can no longer do and have met many people who wished they had done something and not tried it and now cant do it for cost or health reasons. I have of course, done lots of things over the years that didnt turn our particularly well, but have never regretted what I had a go at , but the things I never tried and now will not be able to do remain a regret.
I hope that these ideas set you off in ideas of your own, and wish you luck. If you find even one thing to enjoy for yourself , it can lead on to other things. So, today, pretend you have someone coming to stay with you, and go for a walk round the town to look and see what they might like to visit. Put yourself as a visitor and wander up the little streets, visit your local church, find the parks, look for a seat with a view, smile at people and say good morning. Its a start.