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Unfortunately there is very little you can do when a female is in heat. Even though she is not bleeding anymore she is probably going through the second stage of heat which is the stage where she can become pregnant. You will see a pale yellowish discharge in this stage and it can last from 4 to 13 days.
Over the counter melatoin has been known to help a dog with anxieties , but this may not work when there is a female in heat. Benadryl will make a dog sleepy, but again it is no garuntee that the male will settle. If you have a relative or friend that can keep the male during this second stage ,that may be more prudent .