My t3 reverse was high 39.3), vitamin d 25-hydr was low (22.2), my monocyte % was high (9), and i had a low cd57 (43) could i have a parasite?

Could.: You could but not based on these lab tests. Seems pretty unlikely unless you grew up in a third world country or have an unusual diet. Reverse t3, (liothyronine) vit d and cd 57 are not tests that spring to mind as "routine" and i don't suspect they are cheap. You need a good explanation of why they were drawn and perhaps a second opinion.