i am so glad that nothing nothing had i done这句话语法上有没有错

问题的关键是nothing属于不属于否定状语,它有点属于否定宾语吧.
如果句子是I am so glad that by no means had i done.应该可以.
“强调否定状语的倒装句”的基本用法
强调否定状语的倒装句”是指为了强调句子中针对全句的否定状语,将其置于句首所引起部分倒装结构.常考的放于句首引起部分倒装的含有否定意义的状语有：never,seldom,rarely,little,few,hardly/scarcely ...when ...,no sooner ...than ...,at no time,by no means,no longer,not only ...but also ...,not until,nowhere,neither ...nor ...等.例如：
Never shall I forget this lesson.我绝对不会忘记这个教训.
Seldom in all my life have I met such a determined person.我一生中很少遇见这样意志坚定的人.
No sooner had we reached the station than the train left.我们刚到车站,火车就开了.
No longer will I believe a word you say.你的话我以后一个字也不相信了.
Not only was Churchill a statesman,but also (he was) a poet.(not only ...but also ...连接两个句子时,前一个句子倒装,后一个不倒装)丘吉尔不仅是一位政治家,还是一位诗人.

依旧正确
不过多打了一个nothing
I am so glad that nothing had I done.
Nothing can you do!
都是正确的。
否定词位于句首的倒装，即可以是并列句第二个分句句首；也可以是从句的句首。

i am so glad that nothing i had done.

i am so glad that I had done nothing (wrong, at all).