Hi, there. Just came back from a group meeting and see your poster.Sounds like you are in an emergency situation.Please just walk in to the clinic.And since you don't have UHIP card,you may pay for the description.But if you have paid some kind of insurance when you got here (it is legal process that you must be covered by certain insurance,so I assume you have paid some and got the receipt), then bring the proof, say your receipt, with you and show it to the doctor.
Other information might be useful for your further concerns:
1. Walk-in might take hours till get a doctor to see you.
2.Appointment is definetely the fastest way to get things done but since you cannot predict when you will be sick...unfortunetely you have to wait in the clinic.
3.No matter you are covered by an insurance or not,you have to pay the medicine cost anyway.
Good luck and take care.