Thanks people for the advice. I followed some of it and I also started consciously working on pulling my shoulders back and making sure I don't drop my chin down whilst doing the things - typing, looking at screens etc. And whilst playing. I just ran through a set with minimal discomfort, so I think I might be on the right lines. I also booked a physio. I 'sledded' down the stairs about a year ago on my back (unintentionally) and that can't have helped!