When you talk to doctors about parasites they dont take you seriously. They first assume you are mental, another nut case. Then the stupid unreliable test they give you (which most likely comes out negative) just confirms their suspicions.
The doctor will tell you that you are good... fit as a fiddle. They can only go by what the test indicate. But since you know you're deathly sick and you seen worms in the toilet bowl you will get upset. When you get insistent, upset, emotional or mad.. they will note that then, write you a referral to see the psyc.
ICU says dont forget to take your tranquilizer and your high blood pressure pills when you go to your appointments.
You might have better luck getting tested by some of the labs mentioned here on curezone.
Even if your dr gets a positive test, they usually prescribe you a few days meds and consider you cured... case closed. Hense the psyc referral....so you can bother them not him. They are better at rationalizing your irratic, delusional, insistence... and make it make sense to you, and give you meds to make both you and your worms calm.
Sorry to be a pessimist ... Drs are good for labs, which you can use to get a second opinion. A good ND may be more open to possibility of parasite infection.