Hi Blueteddybambi
I don't recognise the name, so if you are new to Gransnet, welcome (and if not I apologise that I have the memory of a goldfish!)
I have not been in your situation and agree with others that organisations such as the Samaritans if you need someone to listen, or MIND if you need advice are good starting points. It may also be worth searching online to see if there are any local support groups as it is so important that you get the support you need in order to help your husband. You should be able to speak to the consultant or senior nursing staff without your husband being present if you need to discuss how to care for him, warning signs, support systems, medication and possible side-effects and any fears or worries you may have.
Also, as his failing eyesight seems to have been a trigger for mental health issues, see if there are any agencies that offer advice and/or practical support that may help both of you to cope with this. Before he died a friend of mine went blind and found the RNIB helpful; he looked forward to audio newsletters and books etc and said he appreciated that I used to sit and read to him for a few hours a couple of times a week - sometimes just a few little things can make a difference. He also found a volunteer who helped him continue his love of art and painting (that I'm crap at or would've helped) - I must admit I was pleasantly surprised and even amazed at the quality of work he was able to produce without being able to see it himself. Music also helped (listening, and playing when he was able to).
Gransnet can be good for some moral support so please access the forums and let us help prop you up, virtually, as such. Maybe someone who has had a similar experience would be good to talk to, so perhaps consider Angeleyes58xx's offer to private message her. Wishing you and your husband well and hoping things get better for you both.