Welcome to AAM sunflower and my sympathies it's not under different circumstances.
Do you actually need to work, as in can you and your family live comfortable on the 65K.
I wouldn't worry about you getting life insurance, that will only stress you out and I doubt any insurance company will take you on without a lot of medical exams and ultimately a loaded premium.
In any case you don't need life insurance as if anything happens to you, your husband can afford the mortgage.
You seem to be worried that the eventual pension will not be enough, but you have to think that by the time it kicks in, even though it will be less than final salary, you will be at a stage in life where you don't have a mortgage to pay and will no longer need to be saving. In addition, you may in retirement downsize as necessary and realise some money for health care that way.
If you would like to work so that you get out of the house, and it doesn't look like you would be a correct fit for a normal job due to relapses, maybe then the voluntary sector is something to look at.