That type of ear noise, called tinnitus, can be caused by irritation of the cranial nerve. It can take several forms - static, ringing, squealing, wind, etc. I have seen it mentioned in several places in connection to hypo. It's the same sort of complication that causes peripheral nerve irritation in the feet and hands.
I get temporary squealing in one or the other of my ears occasionally. Fortunately, it's always gone away in a short time. Don't know what I'd do if it was constant.