Once again, thank you all so much for your kind advice and help.
Today, after some delays, we finally know more about what we are dealing with, and it could be much worse.
It is a cancerous tumour where the oesophegus joins the stomach, but it is operable and the cancer has not spread.
Next week they will insert a shunt, which should make it possible for DH to eat some solids again, so his weight loss can be stopped.
After that they will, in consultation with the University Hospital in Odense decide whether to start chemotherapy before or after removing the tumour.
I realise it will be a rocky road to travel, but somewhat better, I trust, than the one we thought we were going to have to take.
My husband has opened up a bit about telling close friends and near family, and has found it helpful to talk to others, so that is all to the good too.