Thank you all so much for all the advice. Shelbel, we are trying the plug in device. He is on galliprant for pain.
Dustyhen2010, we are trying short periods in the day time and he seems OK then. He won't use a crate, we did try that when we first got him, he is terrified of enclosed spaces. No doors can be closed. He cannot go into kennels, he was at the vets once for a procedure and they forgot, left him to wake up in a cage. They had to call us to get him out as he wouldn't allow them near him. We were extremely angry as he was very upset and we changed vets.
That's a good idea about the nervous dog coat, collar suggestion, thanks.
Mamma66, we do want to try and get him upstairs if possible. We have tried in the past when the fireworks have upset him but he sits down and refuses to budge.
He weighs 35kg so is a big dog, l have ordered a heavy duty harness to see if we can coax him upstairs using that.