@Smart Red I think not knowing what causes an illness is worse than the actual illness. When you know what's causing the problem it's less stressful, at least for me. So I think I have an idea of how you feel, not fun. In 2013 I almost bit the bullet but thanks to my GP he pulled me through. Most of 2014 was spent getting mobile again. Not as swift on my feet as I was but I'm still chugging along

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Over the years I've had some of the oddest complaints, I'm sure the doctor I had at the time thought it was all in my head. Well he retired and the young doctor who took over his practice actually listened to my complaints. I was having another bout of Bell's Palsy at the time, I didn't think you got this more than once, not true. By this time I was so fed up with things going wrong with me I started to babble about all the weird complaints I'd had over the years, he gave me a funny look and said I'm going to do some tests, you'll be over the Bell's before I get the results back, I'll phone you.
When he phoned he said I've got good news and a bit of bad news, the good news is you don't have Lyme disease but you do have Lupus and I believe this is the source of all those complaints you've had, not nice but such a relief to know what my problem actually was and that finally I had a doctor who would actually listen. So now I stay out of the sun as much as I can ( hard to do when you're a gardener), I planted a shade tree, it's big enough now when the sun moves so does the shade, as long as I'm in the shade I can still be outside when the sun is high

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I'm so prone to catching stuff, my immune system is to put it bluntly, buggered. The shingles shot might not fully protect me but if I get them again hopefully they won't be as severe. The same with pneumonia and tetanus shots, I keep them current.
Annette