Have you had any known exposure to a heavy metal or other toxin? Perhaps, something unusual which the usual chelating may not effect? For example, the Cutler Protocol is mainly designed for mercury (and it would likely help with lead too). I'm not sure if it would help if you've had exposure to arsenic or palladium or some other toxin like that.
Perhaps, if you direct us to a list of all your different symptoms, it would give someone a clue as to what to suggest to you.