Hey Haunted!
First off, you may want to take another look at your goal weight...115 would actually be medically underweight for your height. So it may not be a realistic place to aim for you.
Second, what is your diet like? We may be able to suggest some tweaks and changes that'll fuel you better all day long, which should help keep you on a more even keel.
Give us some more information and we'll see what we can suggest!