Need some advice?

Ok so
Basically back in August after travelling I had some issues with my left ear where it got clogged up. Basically felt like there was water in there that won't leave.
The feeling left.
Went to the hospital to check out my heart actually but the doc advised I get an MRI of i complain about my ears
Turns put had a lot of fluid
Met an ENT he gave me meds
Etc went to a check up maybe in November and he said the ear is way better
But now I still do have occasions where I still feel that liquid feeling
And it can get clogged sometimes
So should I go back to the ENT? Also for travelling by plane
Could I buy those ear blockers (the things you put in your ears when you sleep to avoid noise)
And put them in the airplane? To equalise the pressure basically because my ears always get clogged and I'm scared it's gonna hurt like last time
Need some advice?
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