New baby BP won't eat

[Foxton]

And she just is really jumpy, you barely move or anything and she throws her head like she's spooked . Not sure why that is...

Because she's stressed out and doesn't feel safe. Make sure the tank is filled up with decor so it feels smaller and that she has a hide on each side to go into. If you're constantly in the room maybe even block off every side with some paper to enclose it even more and give her some time to relax.

I've checket at Home Depot and multiple pet stores.. Can't find it. But my cage is too cold and I don't wanna buy a expensive heater

Did you even ask them if they had any kind of dimmer?

Home depot lamp dimmer.
http://www.homedepot.com/p/Lutron-Cr...-100001525-_-N

Decent Digital Thermostat
http://www.amazon.com/Hydrofarm-MTPR...sin=B000NZZG3S

You're 18 according to your profile and it's quite distressing to read how you are responding to advice on what you should do. If you don't care about taking care of the animal that you volunteered to be responsible for, why even bother looking for advice?