Pelvic pain in 15 year old female - Please help! X

So I'm a 15 year old girl that is a healthy weight.  A week ago, as I was falling asleep I began feeling strong pain through out my lower abdomen. It felt similar to period pain but during this time my period was 2 weeks away. When I woke up, it had gone. Two days later I felt the pain again as I woke up but once again it went away and I forgot about it until the the next afternoon where I got it once more. The next day, the pain was less severe, and the next it was also less severe, being sudden, but only lasting 5-20 seconds before going away, the pain feeling somewhat dull. A few days on, I still have it but it's so dull I sometimes fail to notice it. However, it most often occurs to the left, just below my bellybutton, though I MAY feel it elsewhere (low central abdomen, by the cervix etc).  I have no problem urinating or going to the toilet and eating is completely normal. 

I don't know if this is related, but a few weeks ago I also began to feel constant but MILD (may I stress the mild) breathlessness, a feeling that comes and goes for a few days. I also felt similar pain around the chest area. 

Am I going crazy-is this all normal?

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