Rose of Sharon Question

My double rose of sharon which I have had for several years is acting like it is moisture starved. It is all wilty even though I water it when I water everything else. I treated the ground around it with a systemic insecticide just in case it is being attacked underground. The things near it seems to be doing fine.
The lower leaves are turning yellow. I am worried I will lose it.
Anyone have any idea what I can do for it. I had some mulch around the base and I removed it thinking maybe it was too close and cutting off oxygen to the roots. I have tried to think how to help it.
Has anyone else experienced this with their doubles? It has so many blooms and buds that it looks like it is putting out too many. I have never seen it bloom so much before. Could this be a sign it is in distress?
Hope someone can help. I am going to post this on the trees and shrubs forum also.

It kind of looks like a fungus, maybe a wilt happening. Did it get really dry before you first watered?

I usually keep the plants near it watered since it has been a while since it rained.
What would I do for a fungal infection, use a fungicide or is it too late?
I have never had anything like this happen to any other plants before so this is all new to me. Nothing around it seems to be suffering. I have a giant forsythia and some other types of shrubs in the yard and they are all behaving as usual.
What is wierd is that it usually has Japanese beetles feeding on it and even they have avoided it.
Not that I want them to feed on it, but it just seems odd that they aren't.