Hello and welcome,
Thanks for your query.
Let me first talk about the popping sound that you describe. If a person experiences only a popping sound and fullness of the ear, causing slight reduction of hearing, this is most commonly because of wax in the ear accumulating in a slight excess or more. A visit to the Ear, Nose, THROAT (ENT) specialist's office would do you well, as the doctor will clean your ear and remove all the excess wax. Itchiness is also commonly seen with such a condition.
But, as in your case you also mention the presence of pain and itchiness, there is a possibility of an infection. Although the pain would be your primary concern in case of an infection, as it would be much more.
Either way, I think it is best for you to visit an ENT specialist
so he/she can visualize your internal ear, as make sure of the diagnosis. If there are no signs of an infection, the doctor can clean your ear and rid you of your symptoms as well.
I hope I have succeeded in answering your questions, you could write back to us anytime for further clarifications.