What is wrong with me? My doctors are inept and clueless?

I get pins and needles all the time, extreme tiredness, dizziness, feel like I have the flu, headaches, sore throats, muscle spasms and twitches and cramps, and very bad bowel problems.
I've been tested for everything but the tests say I'm healthy.
What is wrong with me?
Update: I feel like I'm dying some nights. I get very bad heart palpitations and muscle fasciculations too.
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