Thanks for all the replies, I appreciate it.
I went to a therapist yesterday who thought that accupuncture would be the best way to solve this. I noticed he worked extensively on the left hip flexor (where the pain is) & right gluteus medius, he didn’t do work on anything else. So I can assume that my right gluteus medius is overly tense. However I still don’t get why it’s so painful when I sneeze, it’s like getting a knife jabbed in me everytime!
I’ve done some research and it seems I either have “popping hip syndrom”, which is caused by enlarged psoas tendons ‘catching’ & irritating the surrounding area or a psoas strain.
In the meantime I will try the depletion push ups & will also roll around on a tennis ball to release my gluteus medius/piriformis