I agree with above posters. Reduce the stress on the plant by trimming off the brown bits. Water well, possibly twice a day, even if it has rained ( some hope!) Give it some soluble plant food.
Hydrangeas are very thirsty plants, you may not get any more flowers this season, but you will save the plant.
I have a growing collection of hydrangeas that I rescue ( cheaply) from the sick plant shelves. I don’t expect too much from them the first year, but they always respond to kindness!
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