so, I used to have a really good memory

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soon as my issues started, my memory became weaker, and weaker

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as an example: when I was younger, I could remember phone numbers and addresses, now I'm lucky if I remember to eat my dinner.. anyway, my question is: does anyone have " memory flashes?". something comes in to your mind and you think, I really need to do this, then a second later you're about to do it and forget? 

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really weird- since you're sat their completely confused