Normally my hayfever peters out sometime in August, having had my worst time in May/June. This year I have hardly noticed it, although I know others have been really bad. However, just in the last week it's suddenly got much worse, I'm coughing, losing my voice and getting the headache from mid afternoon. Any idea what's causing this? I'm assuming something is having a later season due to the strange weather but don't know what it is.