im in brinstar stuck insine a hole witch i fell into right b4 i was about to grab an energy tank

Go to where the three aliens are and jump at one of the walls (Samus must flip for this to work). The moment you make contact, press the opposite directional button and the jump button simultaneously. You should do a wall jump. With good timing, you can continuously use this technique to reach the top. That's where the exit is.