Hi Steph, sorry to hear about your husband. It's completely normal to feel deeply sad. I'm not a doctor, just another carer deeply sad about their loved one and like me you are most likely going through anticipatory grief which is entirely normal. It's OK not to be OK.
You're grieving for your partners life, for the life you thought you were going to have; whilst also caring, and also having to begin the logistical planning of how to move forward.
Please ensure that you just keep talking to people and accessing support. There was a time that whenever anybody asked me anything about my mum (diagnosed with Alz Dec 22) I would just cry, or even thinking about it. Coming up to 15 months I don't cry so readily anymore. I still do now and then, but I think I have now processed what is happening and what will happen.
Sending love