Hi Woodelf!
On reading your question, my initial answer to your question was to think "No, I've not had a PET scan, as I've never even heard of one!". However, having googled it, I either had one or, at least, I had something remarkably similar to one.
What I had was simply referred to as a CT scan. However it was a CT scan with a difference because I had to go to the hospital in the morning to be injected with a radioactive liquid and then return in the afternoon for the scan. I wasn't given any restrictions on what I could do during the intervening period, other than not going close to any young children or pregnant women, due to me being radioactive! (I actually hopped on a bus into town, did some window shopping and went for a pub lunch).
On returning to the hospital, all I had to do was to hop onto a table, which slid into the machine, and then lie still while the machine did its work. Unlike the MRI scan that I'd a couple of days earlier, the machine wasn't noisy. The experience wasn't at all stressful; indeed I quite enjoyed it (especially the fact that I was radioactive for a while!).
The description of a PET scan that I've found on the NHS Scotland website seems to very closely match my experience, even though the term 'PET scan' was never used in my case. The only difference seems to be that the injection of a radioactive fluid is given only about an hour before the scan, and you have to stay fairly still while you're waiting for it, meaning that you won't be able to go to the pub. Sorry about that ;-)
https://www.nhsinform.scot/tests-and-treatments/scans-and-x-rays/pet-scan
So I reckon that you will, as I've previously suggested, find the scan procedure to be an absolute doddle. It's certainly nothing to worry about.
I've bookmarked 'Walking on the Chinese Wall' on YouTube, so that I can find it easily to post this evening (unless someone else beats me to it, of course).
I hope that you can get your washing machine fixed soon (and at not too great an expense). When I read of all the problems that people have with washing machines, I'm glad that I've never owned one. (I simply drive to a lauderette that offers a service wash about once per month and leave my washing there. When I return, a few hours later, all of my shirts are neatly folded, all of my socks are paired together, etc. I don't allow myself many luxuries in life but having someone else sort out my washing is definitely one that I reckon is well worth paying for!)
Hoping that you're not in too much pain now and that you're able to keep smiling. All the best to you and P,
Chris