Sorry, just saw your reply (have been too busy with the Traitors to go on Mumsnet
). I don't think I'll be able to share the links as they will have expired now, but I remember them from my initial consultation (during lockdown I had a completely unsuitable workstation set up and developed chronic pain so went to the physio in desperation.)
Basically, there is the neck roll, starting facing to the left, circling and dropping your chin down to the front, moving it through to end up facing to the right (then reverse direction, right to left).
Then tilting your head to each side and holding gently close to your shoulder with the opposite hand for a count of ten and releasing.
Then a chin tuck when you pull your chin inwards hold then release several times.
Then lying down and raising your arms straight slowly over your head, hold once they're straight on the floor, then release slowly back.
Then lifting a broom handle or similar slowly to shoulder height and slowly moving it to the left, then to the right.
Each exercise is in sets of 5 and is done slowly in a controlled way. I don't know if those descriptions make sense but hopefully they tie in with the YouTube videos you've found. I hope you feel better soon!