Thank you for sharing your dream, and to let you know dreams are usually symbolic in nature.
Snakes are common symbols in dreams, they can represent, lies, deceit, evil, fears, and attacks (even spiritual attacks), and sometimes a renewal as a snake sheds it skin.
Your dream had a cobra snake, cobras are poisonous snakes.
Your brother may be representing himself or a part of you that you identify with.
Have you been under a attack in your family in some sort in real life? Is something injecting its poison into you?
Fingers symbolize your ability to do the necessary things in life and the back of your knee is how you walk in your life, how you function.
So this could be showing how this attack effected you or you and your family.
Being lost, and calling 911 (also dialing wrong number) could speak to your feelings of helplessness, feeling vulnerable, and overwhelmed in this real life situation.
The end of your dream is the key meaning, regardless of what this attack does, you will overcome it and be a better person for it.
Can you link this to anything that has recently happened to you or you and your family, maybe going through now?
Sorry, the computer keeps glitching and sending you the wrong responses.