There are thousands of viruses capable of making you ill as you describe. Some are short-lived. The flu typically lasts quite a while so you probably did not have that. The other viruses that infect your body can exhibit a wide range of symptoms and even time frames. You most likely had a virus; not actual influenza. Keep in mind many people call any viral infection "flu" when in fact it is not.
If you are well, you should be able to cancel your appointment.
The answers in online forums are for information only and are not intended to substitute for medical advice and care. Please see your personal health care provider for further evaluation of your individual case.
Debbie Miller, RN