I recently flew from DFW to LA and got an awful head cold within a day of landing.  I later flew from LA to DFW, then to HOTlanta.  On the last two flights as the plane descended, I felt like I had a pop in the middle of my forehead.  Normally the ears pop, but this was different.  The pain was horrible, almost unbearable.  During the flight I fluctuated between stuffy nose, runny nose, sore throat and headache. 

I was later told that I shouldn't have flown with a head cold or Sinus problems, that severe.  Is there any danger in it.  After about 3-4 days and another trip to NY, I began to feel better.