Sorry to hear that Joe.
I had the Pfizer booster last September and it knocked me for six, I couldn't get downstairs for 3 days as I felt unsteady on my feet and only had cold water from the bathroom tap. I wasn't ill or in pain but I was so tired that I was sleeping almost 20 hours a day until the 4th day when I felt strong enough and steady enough to have a shower and get dressed and go downstairs. I was still tired for about a week after that.
This year I checked at the pharmacist who was giving the booster that it would be the Moderna, I had been OK with the first two which were the Astra Zeneca ones, so I didn't want another Pfizer if possible. They said that they were only doing the Moderna so I booked myself in for October 1st.
When I got there I said I was pleased they were doing the Moderna not the Pfizer only to be told that they had changed to the Pfizer now and they had none of the Moderna left.
Having emphysema and the rates of infections and hospitalisations increasing again I decided to risk having the Pfizer instead of trying to find where I could get the Moderna, as I may still have had a bad reaction with that. Luckily I have not been as badly affected this time, I was still tired but I have been able to get up and showered and dressed each day.
Best wishes for you and your wife Joe.