karmen,
In you first post you said you had a bad strep infection last week....then in your second post you said you have not had a problem with strep. Your son may have not have had strep...but, you did, so, he was exposed. That is a BIG problem and will cause an increase in your PANDAS child.
Christmas 2008 my younger son started to increase in symptoms and we didn't know why......until my husband took a rapid strep test because he had been having a headache (we have the test strips at home) and came back positive. I increased my sons antibiotic and my husband went straight to the hospital (it was late, docs closed..wasn't about to wait until the morning) ...anyway, husband got on antibiotics immediately, and, with the increased dose in my son, symptoms disappeared the next day.
So, just so you know....mere exposure to strep can/will cause an increase of PANDAS symptoms.