Shazza - my sumpathies - I know how you feel! I've been a club runner for about eight years, and have probably spent about a quarter of that time not running. I thought I was one of those people destined not to run as I was always having problems - usually running related but also related to my job (I used to drive 30-50,000 miles a year so had some horrible back and hip problems, as well as the occasional case of whiplash ...).
I used lots of physios who would solve the immediate problem, and anything else they could find, but then three months again I'd be injured again. Eventually I was (after some persistence) referred to the sports injury clinic at a major teaching hospital, who found out what the problem(s) were and after months and months of physio (re-aligning my body, getting muscles that I should have been using but weren't to work again, stretching various ligaments etc!) I've just celebrated eight months of injury-free running (apart from a strained ankle which was my own fault - foot down a rabbit hole syndrome - so doesn't count).
I think this must be one of my longest stretches of being injury-free - my only other was the third time I tried to train for the London Marathon (the previous two times I'd had to pull out cos of injury).
Anyway, persevere, perhaps have a chat to your GP, or ask round your area for names of specialists who may be able to help. There will be, somewhere, a solution. It may not be the obvious one, but you'll get there in the end. LizzyB