A. To cure heartworm disease you would need a very involved and expensive (upwards of $800- $1000) treatment with Immiticide through your veterinarian. This is a controlled medical treatment and has to be monitored very carefully over the course of 2-3 months duration.
There are no over the counter cures for heartworm disease. There is a very controversial "slow kill' method that involves just giving your pet regular heartworm preventative medicine, such as Heartgard (that only kills the baby heartworms and not the adult heartworms that cause your pet to come up positive). Even this has to be prescribed by your veterinarian. This can take several years to clear and is not a recommended treatment because of the potential complications, including thromboembolism and prolonged stress on the heart.
I recommend you discuss these options further with your vet so that you'll can come up with the best recommendation moving forward.
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