Call your doc and tell them what's going on. Call first thing on Tuesday, assuming you make it that far with what you currently have.
My son HATES amoxicillin and the only way I can get it in him is to measure the amount, put it in a small glass bowl, then mix in at least twice that amount of Hershey's chocolate syrup and spoon feed it to him, with ice chips in between. FWIW, he's 7 years old!