Dear Brenda
you are obviously a very caring person who is under a big strain right now. The first thing I would advise you to do is to ring your local Social Services Older Peoples team for help, and ask them for an assessment. As a carer, you are entitled to an assessment in your own right as well. It is also worth looking at whether the Alzheimer's Society has a support worker in your area who can assist and advise you.
Once you have the various options explained to you, you can make a decision. If you have other members of the family, it would be good to involve them too. However, please don't let children pressurise you - they may feel that their dad shouldn't be "put in a home" although they don't have the daily burden of caring for him.
If you do decide that a home would be the best option, have a look round and see which one feels best for you and him. All homes have to be registered and inspected - look at the CSCI website to see the inspection reports (www.csci.org.uk). If you are worried about finances, the social worker from Social Services should be able to explain how this works.
Do start exploing options and asking for support now. You are entitled to it, and it is much better for you and your husband if you can make decisions in your own time, rather than coming to a crisis and then your husband being moved as an emergency.
Finally, and most importantly, you should bear in mind that if your husband is in a place of care, you may have a better quality of relationship. You will be able to spend time with him without having to worry about the physical care.
I wish you lots of luck, whatever you decide.