You might try some Swim Ear...couldn't hurt and might help....
? that is strange..... get your ears checked out
If you have a sensation in your ear, it's very important that you see a doctor to have this evaluated. It's difficult to arrive at an educated guess because other factors are not included in your post - duration, previous ear problems, frequency, lifestyle (do you go swimming often?), etc - however, I would suggest seeing a doctor immediately - ear problems can become very uncomfortable and require treatment - which is not something that you'll be able to receive through message boards on the internet. I hope it's not too serious and that it resolves quickly, ear problems can be very alarming and even the most minor and common problems can result in a high level of anxiety.