Pesticide poisoning. And memory power?

I had an empty liquid Handwash bottle. Once I mixed pesticide in it to kill some pest. After I killed the pest I forget to throw the bottle away. The next day I went to do coaching class away from home. When I came back home after 4 months, I bought a refill pack of handwash and I filled the same bottle where pesticide was there. I completely forgot about the incident. For some days I am regularly using the poison mixed hand wash before eating food. I eat food with my hands. For some days little poison/pesticide has been entering my stomach. Today  suddenly I thought about it and I threw the bottle away. Will the little amount of poison which entered my stomach damage my brain and nervous system.? I have heard that pesticide poisoning harms nervous system. Will anything happen to my brain and memory power?