I have a 15 year old Burr Oak, among 4 other Burrs and several Shingle Oaks and a Chinkapin Oak. My 15 year old looks like the top is weeping and as if the whole tree is wilting. The leaves still look healthy. We have had several severe weather events this summer and the wind blows across the top of this poor tree. My question: Is it just stressed from the high winds, or should I be looking at a more serious problem. Thanks!