[patrick.n]

OK, saw my chiro, and he gave me a working over. Seems there was some tension with the jaw/eustacian tube/upper neck collection, which apparently are linked and can suffer together. The location of pain isn't necessarily where the source is, eh?
I also didn't know about the sinus at the back. However, wouldn't that also have been affected when I duckdived before going to the rope?
I'm going to the pool at the weekend to go down and up a few times. pull down the steps maybe to try and replicate the action on the rope.
Hopefully it's all cleared.

Thanks for your answers.