You will be in a very safe place in the hospital. I volunteer in our Outpatient's cafe, run by the WRVS (sorry RVS now) and see it first hand. Though I have to admit being apprehensive about going back after Lock down 1.
The hearing problem has already been addressed by two sensible suggestions, though our hospital won't let us get away with just a visor, we have to have a mask underneath. You have the right to ask for a translator so ask for a nurse to be with you (if you don't already have one) it's quite normal.
Tell someone, firmly, that your deafness however slight, gets in the way of understanding your consultant. Everyone wants to be helpful.