How big is it? Any chance of a picture, and when did you move in? - is the plant in the ground or in a pot?

its been very dry over the last couple of weeks so it might just be due to lack of water. give it a good few bucket fulls of water and see if it does anything. unless you are in a place that has had torrential rain that is.

Thanks for comments about my pieris with drooping leaves. In answer to Bamboo, tallest flowers are about 30", maximum width about 36" I moved in April 2012, and its in the ground. Yes Seaburngirl, I think weather was probably the reason, though it hasn't been particularly dry here(Shrewsbury) until recently, but we did have a long cold spell. It s much warmer now. Will keep giving it plenty of water.
Since I posed the question, glad to say some leaves are much less droopy and there a lot of very beautiful flowers.