Can You Correct My Grammar Please?

Hello. As you read my question, will you help me? I have done my best to revise this piece but I'm not perfect at it but this is the best I can do. Will you please help me? It's from my story on Wattpad.

"Agh!"

I shot up straight in bed, I was covered in sweat and breathing heavily. I looked all around me, trying to get a sense of where I was. Images flashed through my head all at once.

My eyes, as they focused I noticed it was just my weary bedroom. I was shaking to the bone. I sat up and felt the itchy sheets upon my dirty skin.

I could feel the air being sucked out from my body, the atmosphere becoming more and more tight. I struggled out from under the blanket covers, racing to the window. I pounded against the window until my fingers felt scrape on the window latches. With one swift movement I flipped them to the side and opened the window with all the strength left in my body. I immediately took in a huge breath of cold air.

"Sam, are you all right? You were crying out?" My brother, Kai (pronounced with the K sound and the word, I), screams out behind my door.

Shaking, I make my way past my unorganized room, well more than it was before, and open the door. There stood Kai, worried evident in his eyes.

"K-Kai" I whimper latching onto him bearing my head into his neck. Surprised by my outburst, Kai coos soothing words in my ear and rubs my back.