Do not water if the soil is still moist. You may have had some root death during the period of non-watering and now you are technically over-watering which is counter productive to replace those roots which have perished. Hopefully its not too late. But do your best to eliminate all stressors: not enough water, too much water, too much heat, too much cold, keep it in a semi shady area not direct sun unless its really cool where you are, do not fertilize right now.
Thank you, are you sure it was because of under watering. My brush cherry is totally fine and I did not water it for 6 days too. I believe the spray caused it. I placed it in a shady area. Should I remove the dead leaves hanging on the tree?