I've been taking Concerta for about 6 weeks. 3-4 weeks 18mg and now the past 2-3 weeks at 36mg. The past several days I've starting hearing a slight ringing noise in my right ear. Has anyone else experienced this while taking Concerta?

I didn't have that side effect, but I do know that many medications have this (called tinnitus)as a side effect. Aspirin is one of the worst for causing it. It can also be caused by stuffiness in the ear like when you have a cold.