Hi leah,

the possible causes of this sensation you are experiencing are numerous and will likely only be diagnosed through a process of elimination. The first thing that you need to do is to see your doctor, and to be referred to an ear, nose & throat specialist. If you have had problems with your ears in the past then this may be a factor. But again there are numerous variations of middle & inner ear disorders which can only be diagnosed by an ent specialist.
So again, go and see your doctor. Don't spend time researching your symptoms online as you will just worry yourself needlessly (trust me on that!). Just think that each day you don't see your doctor is a day longer with this problem that could possibly have been avoided.

Take care, all the best...