parasites have a lot to do with overall health. Eating shit like salts and sugars... you'll never get rid of them. Ever.
Consider doing a water-only fast sometime in the future. If you have meds you can't get off, do Barefoot's 14-day orange juice fast (it's not a typical fast) found in his "Book I" on curezone.
Just some friendly advice. I know it's hard, sorry to be so direct.