Is my cat suffering from accute deppresion?

Well a few months ago my mom and dad forced me to put my cat Wanda outside and keep her out there. She is NOT an outside cat btw. Well she spent the next few days trying to get back in.

Now sometimes she dose make it back in when i go out in the backyard sometimes, and when she dose, she starts running arround SCREAMING at everybody, she yowls and yowls and yowls and doesnt stop and i cant figure out what she wants.

When she is inside she wants out and when she's out she wants in, like she cant make up her mind. Also she has lost her possistion among the inside cats so she goes around pee'ing on everything.

And before we made her an outside cat she was VERY overweight, now she is VERY skinny. She used to be very protective over the food, now her mom(cleo who was also forced to go outside but doesnt have ANY problems) doesnt let her eat any, i have to poor htem seperate bowls.

Not to mention i thnk she may have diabetes =/.