Thanks for your query.
does cause increased fluid volume and this includes the fluid inside the inner ear
However, this should not cause you extreme pain or discomfort.
You could be having a recurrence of your ear infection
, as pregnancy lowers the immunity and makes you prone to infections.
Also, there could be other causes like migraine etc that present atypically.
In pregnancy, you should not take any ailment or complaint likely.
I would advise you to mention this to your obstetrician and seek a consultation with an ENT specialist
at the earliest.