Why was severe ear pain in an adult followed by complete numbness of the ear and all with no signs of ear drainage?

There is no way to diagnose this set of symptoms without examination by a competent medical practitioner. The reason is that there are dozens of different things that can cause severe pain followed by numbness. The lack of drainage will generally eliminate a few possible conditions, but the list of possible causes for an individual who might present with those symptoms will remain long. Lastly, this is not a "normal" or "common" affliction like a cold or the flu might be. A professional will have to sort it out. The best advice anyone could give is to seek out a physician, and with no delay. From what has been related, things seem to tend toward "progressive" here. If the problem is serious, it might be regrettable that there was any delay in seeking that consultation.