Write

"you are my favorite professor. -James Forrest
P.S. if you give me an O I'l give you a galleon"

I'm scared for Hufflepuff's upcoming trip with professor Lear.

My Advice: Just don't take part. Hide yourself in a small room in Hogwarts forever so no one can force you to take part. If you really want to participate, then just lock Professor Lear in the Professor's lounge: no one can find him there, especially not the Professors. Then use a megaphone and tell everyone: "I AM MARIAN LYNCH AND I HAVE LOCKED IN PROFESSOR LEAR". No one will guess you did it! 

My Problem: I feel as if I've been Sorted into the entirely wrong house - Slytherin, but I'm a definite Ravenclaw! What do I do?

slice the sorting hat in half and run away from hogwarts.

My sister doesn't believe that I'm a hufflepuff. How can I prove it to her?

Stamp up and down screaming "I'M A HUFFLEPUFF, I'M A HUFFLEPUFF, I'M A HUFFLEPUFF". She'll be so happy and not annoyed at all! 

I want to slice the Sorting Hat in half, but my knife is blunt and I can't sharpen it. What do I do?

Sharpen the knife on your bare leg, and if that doesn't work, try someone else's leg.

I want to scream, but my voice is gone. All I can do is stomp my foot, but my sister is confused and not at all thinking I'm a Hufflepuff

Paint yourself yellow, start only wearing yellow clothes, dye your hair yellow and start cuddling a family of wild badgers. As for your voice, just keep on trying to scream till it comes back. 

My leg is hurting. (I wonder why?) And I still haven't cut the Hat in half. 

Rip it. Or run away with it.

I can't dye my hair yellow because my hair is brown. what am I to do?

Shave your hair off then you can paint your scalp yellow.

I cannot sleep at night I have nightmare about this horror movie I watched. How do I stop getting nightmares?

eat cheese right before bed and, if you can't sleep, think of monsters creeping out of the shadows.

My mom is mad at me for shaving my hair.

Shave her hair then

My guardian is angry at me for being a Griffindor what could I do?