The first thing that I misunderstood about the English is that common phrase at the beginning of nearly every conversation: "How Are You?"
It turns out that when they ask that question, they don't really want to know! It is just a part of the "protocol" when initiating a conversation. It doesn't really mean anything.
I have lost track of the number of times I have answered the question truthfully: "I'm OK, but I've got a bit of a headache, and my wife has been getting on my nerves and my girlfriend is getting a bit clingy. And I've got a strange rash on the tip of my ..." Oh No: That was the wrong answer. Apparantly, any answers that include medical history causes total confusion, and makes you look weird in their eyes. But they still have to ask.
Unless you are talking to your doctor, the correct answer is a positive answer that includes the word "OK". No matter how you are feeling, just say that you are OK. Don't give any details. You are OK. Trust me.