Hi Debs,
Although younger than you, my story is very similar. I have lost count of the number of MRIs I've had and varied diagnosis - none of which has helped. Wasn't until a neurologist assessing me for MS suggested that hormone related fluid retention can cause issues similar to Carpel Tunnel, but in different places (for me it was my shoulder and fingers initially, then later my ankle, foot and random toes) that I found answers. It is believed that what f-r does is niggle the nerves, but as nothing is actually trapped, it won't show up easily in MRIs/nerve conduction tests (though thinking back, the physician who did my nerve study did mention issues relating to a woman's cycle; at the time I thought he was nuts). It got to the point I couldn't wear rings, necklaces, bras with straps or normal ankle socks without pain and or tingling. I was so scared. It put an end to my love of running too.
A few years down the line, the only advice I can give you is: eliminate vit B12, iron etc deficiency (if you haven't already); push to see an endocrinologist (in case it's another hormone causing the problem - you can then be referred to a gyn. if required); if they offer ADs for pain/symptom relief, agree only if they still agree to investigate further and read up on their side effects first (I ended up in casualty on one!); remember that the symptoms will probably go - they may return again too, but it will once again ease; keep a diary so you can look for connections between symptoms and hormones; find a sympathetic GP, ideally a DRCOG qualified one, and don't be afraid to move practice if you're not happy (best thing I ever did); once you know it's hormonal, don't worry about damaging yourself in the gym/exercising. Instead, listen to your body, alter your routine if necessary (I now have to cycle rather than run) but try to avoid doing no exercise at all if your'e used to it previously - providing you're not in pain; try not to feel like you're 'weird' because your symptoms aren't like the majority of people's on here, nor convince yourself it can't therefore be hormonal (I've never had a hot flush, for example, and for a long time believed this meant that I had some form of undiagnosed illness rather than crazy hormones - this meant a worried even more!).
Sorry if that sounds long winded. I just wanted to get across what I wish I had known three years ago. Now, thanks to this site and its amazing forum members and a wonderful new GP, I have trialled both HRT and Qlaira and have found a lot of relief. Have bad days, still, but now I feel far more in control of both my mind and my body.
Good luck x
PS Have you googled the 34 symptoms of menopause site? V reassuring.