Please help me improve the following email

Please help me improve the following email. Thank you very much!

I am totally saddended by your decision that I am still required to transfer to a new post next month, which I trust is totally unfamiliar to me and the workloads should be far higher than my current one.

Indeed, the above-mentioned ruthless decision do recall my painful memory that I was urgently and abnormally deployed to a post without my prior knowledge and discussion by your predecessor five years ago even though I understood he clearly recognized the history of my mentall problems and lung cancer for my mother.

Nevertheless, I was compelled to accept the arrangement and tried my best to manage the post, however the challenge was far beyond my expectations and capabilities to handle and I was unluckily diagnosed with lung cancer just one year after taking up the post. Learning from this horrible lesson, I genuinely cannot afford to endure a historic recurrence.

I really wish you will thoroughly reconsider my stiuation on compassionate grounds and make a situable arrangement for the best interests of my health conditions and departmental management. Thank you.