comsat2
Sounds very much like Lyme desease. That you don't show any symptons now apart from the rash is normal. If it's Lyme, symptons will come only months later, normally.
I believe a lab test is called for; but unfortunately I don't know if it is too early. But speak to a doctor, preferably one with experience in that field.
I know nothing about the effectiveness of the Lyme formula, but Humaworm does not sell stuff that's useless, that's for sure.
I hope RG will find the time to give you some advice here, and how best to proceed.