I've name-changed for this one.
I'm undergoing investigations for a possible/probable chronic, degenerative condition and oscillating between fear, sadness and an odd feeling of acceptance which I didn't know I was capable of under such circumstances.
I know that there are plenty of people out there (including some amazing MNers) who face these types of challenges with incredible positivity and fortitude, and I'm pretty determined to join their ranks despite my terror and dark moods. I have a history of anxiety/depression, so am worried that I could easily return to the "dark side" in the face of this, and feel scared when I start noticing my mood sliding. But I also know that as I've got older (mid-30s), I've been able to get a type of more distanced perspective which is at least partially (only momentarily on some days, but still...).
I don't know what I'm asking of you lovely people, really. Just wanted to feel less alone with the battle. These are the things I find helpful, but would love it if people could help with their own perspectives which they find useful.
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All anyone ever has is now. Regrets for the past, fear for the future, etc., are all just mental constructions and they can be allowed to pass. I'm not religious (though some days I dearly wish I were), and don't believe it's likely there's anything to look forward to after dying, so might as well concentrate on whatever's going on now.
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Over the course of history, and all over the world today, people have had to deal with disability, death, loss, massive hardship.... I'm doing my best to try to let go of the unreasonable expectations I'd created for life - actually, there ARE no guarantees that these things won't happen. Why NOT me?
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Painful as it may be, the above also applies to my children (who are at increased risk of the condition too).
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There's ALWAYS something to be thankful for. For instrance, people can be so kind, and so generally brilliant.
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There's almost always a way to try and laugh about things.
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Crying is fine.
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In 100 years we'll all be dead anyway! 
Sorry for the long post!
Thanks for reading