No side effect of Trimethoprime
I have gone through your query, medical history; it most probably suggests that it is not the side effect of Trimethoprim.
For your kind information common side effect of the Trimethoprim may be diarrhea
, stomach upset
, loss of appetite, changes in taste, or headache but not related to the ear.
To reach the near diagnosis and exclusion of the other disease you may go for the
1. Otoscopic examination of the ear.
2. Tunning fork test.
3. Pure tone and impedance Audiometry
4. Blood pressure Measurement and
5. Nasal examination.
If you have any doubt, I will be available for your query.