Hello Su,
Thank you for sharing your dream with us. Please take everything that I share to the Holy Spirit as He Alone gives the accurate interpretation.
I think the dream is showing you what will/or has happened (depending on when you had the dream) but God will take care of it, “it” being whatever the black snake (could be something demonic, slander, poisonous thoughts/depression, etc) represents. Keep praying and don’t fear.
Shalom!
