Re: why???????
Racing heart in the AM is a typical adrenal issue - you are putting yourself unnaturally under too much stress. You are probably too hard on yourself because as a child you were trying to please someone, most likely a parent who did not love you unconditionally.
You need to find some help to peel the layers away to realize why you are feeling the way you are so you can let it go and get better. Bodywork can be a great tool to find energy blockages that might also drain your energy.
I learned that I was trying too hard for example because I was still trying to get my moms approval. My mom was not very present when I was little because she helped my dad built his business. I always felt like I was more independent as a child, but I had no idea that still affected me that much. Once I was aware I could release it. It felt like a huge weight was lifted off my shoulder. A very intuitively gifted bosyworker helped me identify this problem. I have felt a lot better since then and so can you.
In the meantime, you may also want to check out and embrace the book the 4 Agreements:
http://www.herbalhealer.com/fouragreements.html
Hope this helps you, but please try and find someone to help you - it is much harder to do it on your own and will unecessarily take longer.
Blessings :-)