Your doc just did the physician equivalent of "closed, cannot reproduce".

Also, shame on you for not finishing your antibiotic prescription. Always finish your antibiotic! If you don't finish, you run the risk of a resurgence of the infection, except this time with bacteria resistant to the antibiotic you failed to finish.

If you really feel like you need a private stash of antibiotic, buy amoxicillin for aquarium fish instead of saving portions of old prescriptions. And make sure you weigh yourself and appropriately calculate the mg/kg dosage before using it.

(I understand that this is hypocritical to shame someone for not finishing a prescription antibiotic and also to recommend misuse of veterinary antibiotics.)