Anyone can show me how to warite an email to my boss for clarifying what situation is. Because something happened but not the case they have commited. I am being in a very unclear envoirnment, such as report to whom and any changes for my title, salary and scope of work. But massive of work all point to me. I don't know what is going on. I want to clarify about it. As the man who committed me is our CEO and my immediate supervisor is VP, I don't know how to send them an email to notify them what is my concerned. Please help me, I am in panic.
Please write a draft and we'll check it, Ssmm.
Here is my draft, please comment.

Dear xxx,

Thank you for offering me the opportunity to take up the additional responsibilty of marketing. (but without offer me any title) I am eager and interested to try my best to perform the job well. However, I cannot afford this additional job loading which is on top of my existing work. Basically, this job occupied most of my time, I cannot spare time to support my team and cannot perform as a good leader. Although they did not annoyed with me but I felt shame to them. The most important thing is my direct supervior was not support with me. I really get into a very trouble situation. Please advice me how can I do? I do not want to perform both of the job so bad.
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Dear Mr ***,

Thank you for offering me the opportunity to take up the additional responsibility of marketing. I am eager to try my best to perform well, but I don't think I can afford this additional workload on top of my existing work. My current responsibilities occupy most of my time, and I don't feel that I can spare time to support my new team or perform as a good leader. Although they do not seem to be disappointed with my performance, I feel embarrassed that I cannot contribute appropriately. Most importantly, I don't feel that my direct supervisor has supported me. I am in a very difficult position. Please advise me as to what I should do; I really do not feel capable of performing both jobs adequately.
Wow! excellent! Thank you very very much! If I can write my English like yours that will be very happy.