Hello, Welcome to Just Answer and thanks for your question. What toxic substance were you exposed to?
This service does not recommend specific toxicologists because we have no way to verify their credentials or expertise. Your local Health Department is your best source for verified toxicologists. I'm concerned though, that finding any exposure that happened months ago is like trying to identify who you caught the cold that you had last Thanksgiving from. Probably any chemical would long have been circulated out of the environment just through normal traffic through the area. Your Health Department may be better able to shed some light on it, although you may never be able to associate your symptoms with any exposure.