What can be done for severe ear pain?
First off, it sounds like you are really suffering. I wonder if you have been seen by an ENT (ear nose and throat) specialist, as it sounds like your ear pain is severe and needs attention soon. This specialist can investigate why you get so many ear infections, and work with your diabetes. Perhaps you need tubes in your ears to help them drain, or you could chronic sinus problems that make your ears plug up. You may want to see your dentist too, as your problem may not be from your ears, but it may be from the jaw.
One last comment: please watch how much Excedrin you are taking. This medication contains aspirin, which can cause bleeding if not taken as directed. Also, aspirin can cause ringing in the ears, which could make your ear problems worse.