Ear clogging

So I had a full blown panic attack today because my left ear was blocked and all I could here was my own voice (like when your head is under water). This went on for like 45 minutes, I was crying and trying everything from turning the shower on and have it steam up the bathroom then trying to equalize-which didn't work. It eventually went away but it was extremely uncomfortable and I felt like I was going crazy (im super sensitive when it comes to my ears and hearing) Has this happened to anyone yet? And if so, what do you do to get rid of it?