Hi,
I am so sorry for what you and your husband are going through. I lost my husband to PC in June. We had just celebrated our 27th anniversary. We have two kids. Our son is now 21 and our daughter is 10. This past 10 months without him have been hard. But what you are going through now is equally hard. I was at that point about a year ago, wondering if he would suffer, wondering when to tell the little one that daddy would not get better. It was at just this time last year that he really started to decline.
Every person with PC is different but from my support group and from my own experience I know that things can go downhill very quickly. You should be prepared for that. Make sure the will and advanced directive are in order right now. While your husband feels reasonably well spend a lot of time doing fun things. Invite people over and enjoy their company. It may sound silly but I think Wayne really enjoyed the last year of his life. (He was diagnosed in stage 2 and had a Whipple followed by chemo and radiation. Died anyway as most Whipple patients do.) We spent lots of time with family and friends and tried not to think about the cloud hanging over us. Wayne stayed positive. I just couldn't. If I could do anything over it would be to live more in the moment and not worry so much about what was coming. I had no control over that anyway.
In terms of the final stages, again everyone is different. My husband's passing was very sudden and very peaceful. He stopped being able to eat and got thinner and thinner and, along with that, very weak. But he was still living! Six days before he died, he went for a 45 minute walk with his sister. Three days before he died, he ate a little Chinese food in our dining room with friends and had a lively conversation about philosophy and religion. Even the day before he died, he got dressed and came downstairs, although he kept falling asleep. The day he died he would not get out of bed. I had helped him get the the bathroom and when we got back to the bed, he gave a little shiver and died very quietly. He was in no pain at any time.
In addition to not eating, be on the look out for ascites, the buildup of fluid in the body cavities. That's a typical end stage symptom and your husband may need a stent or shunt to drain the fluid. It makes the patient more comfortable but, in from what I've read, signals that things are nearing the end.
My best advice is to enjoy every moment right now. There is no way of knowing how long you have so go out and have fun. Make sure your important papers are in order. My husband made his funeral plans (didn't trust his agnostic wife!). He was ready to go and I hope he went to a better place.
Please take care of yourself as well. You'll need to be physically and mentally strong for the task ahead. My thoughts are with you.