Is it possible for ear to be fully clogged only by wax? been using ear drops but they only made my hearing worse.

Sure: Not infrequently, a patient comes to the office with muffled hearing and we find that the ear canal is blocked with wax. After flushing out the wax, the patient's hearing is normal again. The key is prevention, meaning such a patient can use a few Debrox ear drops each month for a few months (or longer if needed), after getting both ears examined and cleared of wax.