Why did i have to pay for my prescribed medication when i paid for the consultation?

Usually not combined: In the US, buying a medication is almost always separate from paying for a medical consultation (US laws maintain the separation). The thought is that by separating the prescriber of medication from the seller of medication, there will be no conflict of interest, no incentive for doctors to "overprescribe." Other countries may work differently.

Odd question: When you consult with a professional architect to design your house, would you expect them to pay the contractor to build it? Be clear with the process. When you consult a physician on how to treat an issue you pay for their time/education/experience. They do not invent/prepare/get approval & stock the medications you may eventually need. You pay for what you consume. The idea may be new to you.