Inner ear problems can be affected by a number of issues, such as having a cold or other infection.
Bear in mind that cabins are pressurised to a set pressure, regardless of what altitude and determined by the crew. (I'm sure someone more knowledgeable will be along to confirm this).
Some aircraft, like the 787 are designed with higher cabin pressure in mind. However, what may really be the issue is rate of change of pressure on climb out....which is difficult to determine.
Maybe hire a light aircraft and pilot to see how you go?
