Your blood calcium in relation a high PTH is in my non-medially trained and humble opinion, is a classic case of Primary Hyperparathyroidism.
Whilst it's always a good idea to rule out sarcoidosis with a chest x-ray, in terms of blood tests, blood calcium tends to be raised in sarcoidosis, but, in sarcoidosis, the PTH would be rock bottom, off the scale low, virtually undetectable! Why? Because like most endocrine systems, it works on what's called negative feedback. Blood calcium low - parathyroids pump out PTH to bring it back up! Blood calcium high - parathyroids shut down and stop PTH production in order to lower the blood calcium to normal levels. The only medical cause of an elevated blood calcium in conjunction with an elevated PTH is our old friend Primary Hyperparathyroidism. The major problem with diagnosis of Primary Hyperparathyroidism is that GP's don't see much of it and many of them have not seen a patient with Primary Hyperparathyroidism. I was my GP's first case and he's in his 50's! As such my GP wasn't very good at diagnosing me. Even having a blood calcium at the high end of normal and a PTH at the high end of normal is not normal! When a blood calcium id at the high end of normal - say 2.6 then you would expect the PTH to be at the low end of normal or even lower than the low end of normal.
Primary Hyperparathyroidism is always diagnosed on the basis of blood results and never symptoms. It has to be said though that any endocrinologist worth his salt should be able to diagnose you correctly on the basis of what you've told me.
Symptoms wise, you sound like a mirror image of me!
10 years before surgery, I started to feel generally unwell, especially achy in winter. My ribs would be tender and painful to breath in and out, sneezing was agony!
'pseudo-gout or pains in my shoulders and knees, tenderness felt when I push the ridge of my shin bones' - been there had that, got the t-shirt!
'quickly loose concentration and forget things, apathy, aches down my leg' Had all that, had to quit my business and am just in the process of starting back up! As I like to put it - 'I became very stupid very quickly' - besides the memory problems - thinking things through became a real struggle.
When you finally get to see a consultant, concentrate on the bloods - it is never ever normal to have a high blood calcium and when in conjunction with a high PTH, the only diagnosis can be Primary Hyperparathyroidism. The only cure is surgery and the sooner the better. It is possible to short cicuit the system and go straight from a GP to a surgeon - my surgeon (Mr. Andrew McLaren at Buckinghamshire NHS) will accept patients on basis of blood test results and a letter from the GP. Once you're under a surgeon - they will sort you out. Medical endocrinologists can plod along and leave you hanging. My medical endocrinologist was willing to let me wait and get sicker, but I had done my homework and already e-mailed my surgeon. My medical endocrinologist referred me back to my GP with the diagnosis of 'Mild' Primary Hyperparathyroidism and I got my GP to refer me to McLaren for scans and surgery.
Do your homework, don't take no for an answer, line up a surgeon if you can and you'll get there. Any questions, just shout out! I've been through it all before - the misdiagnosis, the ignorance about how this condition can make you feel. Where abouts in the UK are you? You may have a good team on your doorstep.
All the best,