Have you had hospital treatment for positive C-19 Poll? I would change my GP as if that is her suspicion she must refer you to the appropriate trials, there are several Doctors in the UK doing studies on possible long-covid etc..
As oestrogen levels drop muscles maybe come lax = aches and pains: frozen shoulder, neck pains, hip and pelvic pains etc.; not many GPs are aware of the distressing effects that a lack of oestrogen might cause. Have you had a pelvis and hip X-ray or scan? Hip pain is felt in the groin, back pain over what we call 'the hips'. Sciatica stems from the nerve root in the buttock.
A few years ago I would wake with intense pain deep in the centre of the buttock over the 'hip', so bad that I would cry out silently. It took 8 months to realise that it was being caused by a constant leaning over antique cabinets to look at jewellery
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Your GP is hedging by the sound of it. At the very least she could have referred you to a physiotherapist as it's easy to get into bad habits. Also do check your seating positions as well as foot wear ;-). Which blood tests were you sent for? Chest X-ray is probably due to breathing problems?
The Change - I get breathless occasionally. It used to happen when I was due a period I would feel really bloated and couldn't draw a proper breath, it happens these days when I take exercise. Crashing fatigue is 'common'. As are aches and pains, vaginal atrophy and bladder problems.
Browse round. Some find that keeping a mood/food/symptom diary of use. Ask for a referral to a menopause clinic too ;-)