There are lawyers, frequently nurse-attorneys, who specialize in cases that go before the BON. They know what is appropriate, and can help you protect your license. This really does not seem like an offense that should strip you of your right to practice.
The meds were retreived, you did not divert them for yourself or for sale. You are, presumably, clean. Seems like you made a weird error about discarding them, and then you began to panic.
Take care of yourself. Talk to a lawyer!