“我只是有一点点儿说不出的难过”用英语怎么说？

一点点要用little而不是bit
说不出有不可形容或不能用言语表达两个意思，后者可以用unspeakable,beyond words,more than I can say.Beyond words更地道

不能用have 那是中式英语，可用BE和FEEL。
I am just in a little sadness beyond words
Ijust feel a little unspeakably/intangibly/ sad.
I just feel a little sad beyond words.
I am just a little sad beyond words/expression

I just feel something upset that is hard to describe.

I only have the sad little speechless

I just have a little bit sadness can not tell (you).