Re: Ear infections
I haven't really dealt with ear infections per se, but I have MS and two of my primary symptoms are vertigo and balance issues. It can be very frustrating but in my experience employers can be quite understanding; I suspect more so in your case where the situation is obviously temporary. I hope you feel better soon. The medication I take to alleviate symptoms does a good job of making me functional at work, though I'm not allowed to drive while on it.
One last piece of non-health related advice (with disclaimer that I'm not a lawyer, yada yada) is to document your doctors visits and any Dx/Rx. The paper trail could come in quite handy.