There are many great intellectuals who believe that synesthesia is a tremendous gift, and the sign of an elevated mind. I learned this because when in Europe I was seeing a psychiatrist who taught me that while my psych diagnosis is bipolar disorder, the other experiences...the ones you've described...are not necessarily a psychiatric disorder.

Please find books about what you are experiencing and study them. I encourage you not to think of yourself as flawed, but as extremely blessed with a great gift.