You know what the big problem is. You are not really playing the odds.
No matter what you believe, fact remains that those kind of parasitic infections are rare.
You shouldnt just focus on rare and exotic diseases just because we failed to get a proper diagnose. Ever considered the possibility that its just a failing healthcare system that just doesnt have enough time available for its patients...? Besides its not really anything new anyway for a doctor to make a mistake/misdiagnose. On top of that, some diseases are extremely hard to diagnose even for an trained eye.
Would be a shame if you mistake your symptoms for being parasitic while in reality its just a common case of good ol cancer that is growing trough your skin.