请帮我检查一下,这段英语有没有错?我写的.

请帮我检查一下,这段英语有没有错?我写的.
I think the most important thing of a person is health.I dread falling ill,but last weekend I had a toothache again.I could not sleep when a toothache got me down.I am still hesitating to go to see a dentist,because I am afraid of the pain which is caused by the dentist treats my tooth,Maybe this is a little absurd.I have ever gone to see a dentist when I was a college student.The dentist drilled my tooth and slit my gum,it was very painful.He said this is the only way to cure my tooth.But at last my tooth became black.He raged against me when I went to the hospital to ask him the reason,he spoke with menace in his voice.It was undeniable fact that it was his fault but I lack of evidence to demonstrate it.Maybe he is an amateur dentist; I knew he defrauded me.I did not want to conflict with him.So I gave up.The black tooth of mine is not shiny,but I can not neglect it when I glimpse at myself in the mirror.The more I see the black tooth,the more I am scared of dentist.So I postpone going to see a dentist again and again.I do not want to denounce the dentist,now I just want to ask the dentist not to exaggerate too much,if you are not sure to cure the anyone’s tooth,please let other dentists do it.I still have to go to see a dentist.I hope this time I can meet a good dentist.

of ---to
I am afraid of the pain which is caused by the dentist treats my tooth 最好重写
既然是BY 后面就不能是整个句子
I have ever gone to see a dentist when I was a college student.
前面是现在时,后面就是过去了 晕
i ever went to see a dentist when.
He said this is 时态不对
看不下去了