Hi. I had this and it was eustacian tube dysfunction. I would talk to your doctor about it. For me, it turned into vertigo complete with nausea, tinnitis, and times of poor hearing. The vertigo was very troubling as I could do nothing during these episodes.
I saw my primary care doctor---- and an ent. My issue resolved with their help.
So, call your doctor. good luck
See an ENT - it could be nothing but it could be a CSF leak (cerebrospinal fluid).