How Can I Reverse Or Quickly Flush Zyrtec From My System After Developing A Droopy Eyelid And Other Side Effects?

Hello, i took some Zyrtec and started to have a headache almost immediately (pressure behind temples). I also felt drowsy and loopy (in regards to processing regular tasks). Additionally i have a dry throat and jaw pain. These i understand are normal side effects but the one that concerns me is the droopy eylid that onset approx 6 hrs after ingestion. There is no swelling and i can move the eyelid but in relaxed or normal state it is droopy. How can i reverse this medication or the fastest way to flush out of system.