Its tough being at that age, you've got a lot of stressing and your mind and body are going through a lot of changes. Give meditation a try! I'll calm your everything. Youtube meditation music for positive energy. Listen to it for at least an hour or as needed. To get comfortable just do something you enjoy. When your ready focus your mind on your breathing, in through your nose, out through your mouth. You'll only be able to focus on your breathing for a few breaths so don't stress out about. If it makes you cry, let it... you probably needed. Once done return to your breath. After a few breaths stay to yourself with confidence things you feel you are or need to hear and start it out with I AM... I AM CONFIDENT, I AM CALM, I AM SMART, I AM CAPABLE, I AM LOVED... repeat the words of your choosing until you start to feel better. Tell yourself everything positive you need to hear. By doing this you are rewriting your brain to give you the confidence you need. If you are having difficulty sleeping change the wording to I AM SLEEPY, I AM PEACEFUL or something along those lines. I know it sounds odd but it helps more than you could ever imagine.
You are growing through adolescence which can be a very confusing time. Don't ignore what you're going through, but try, I mean really try to talk with someone, perhaps a counselor or someone you trust. I went through a very similar experience at those ages. The other comment has some truth too, about changes in hormones at that age causing feelings of instability. Just know that it will eventually pass.
Hi Ellbob. Could be hormones. You are just growing up is all. I used to have pain as a child. My grandpa said,"It's ok. Those are growing pains.".
I was 5'6" in the 4th grade!