What is wrong with her?

* i will take her to the vet tommorrow* Lately Cloudy has been behaving strangely like, she gets up at night and gets restless, she cries and yells all night and when i go check on her she just sits and meows at me,, She is 7 months old.She was always quiet. She peed on my moms bed today which is weird bc she never EVER did that, She already knows how to use the litterbox.

Am i just overreacting or should i worry?

Is she spayed? If not, when you get her to the vet have him spay her.

Is she fixed?

no shes not .. how much does it cost?

Depends on where you are located. it doesn't matter how much it costs, it costs more to raise kittens as well as the frustration when she is in heat to you and your family- if she gets outside, she will get pregnant-
Here are some spay and neuter resources

Meowhoo.com

The other good things: she will most likely stop or slow down this behavior - and she will be healtheir and possibly live a longer life!

I agree - these are signs of heat behaviour and she must get spayed, as it will only keep returning until she is mated or spayed.