Ear Infection possible source of headache

I had a radical mastoidectomy about 40 years ago when I was a child.  About 20 years ago I had an episode of headaches.  I questioned my ENT doctor whether my ear that had the surgery might be a possible factor in the headaches.  I was told it was not.  However, about 3-4 months after that, flying over the ocean, my ear suddenly began to drain.  I went to the ENT doctor and sure enough I had an infection that took several months to clear up.  The good thing about that sudden draining was that I no longer had headaches.  Now, another 20 years down the road, I am having a lot of headaches.  They may not be related at all, but recently the headaches changed a bit to where I was having constant headache with no relief from any medication and daily low grade fever.  Prior, I could get some relief from Relpax, but this episode could not be relieved.  My ear was filling stuffy and then several days ago, I had some drainage and now the headaches have seemed to stop.  I am still having low grade fevers.  Is this something common with radical mastoidectomy patients?  I have not been able to find any information on the topic.