en_tn/dan/07/15.md

my spirit was grieved inside of me ... the visions I saw in my mind troubled me

These two phrases describe how Daniel was feeling. The second one gives more information about the first one, explaining about his grieved spirit. (See: rc://en/ta/man/jit/figs-parallelism)

my spirit was grieved inside of me

Here "my spirit" refers to Daniel himself. Alternate translation: "I was very sad inside" (See: rc://en/ta/man/jit/figs-synecdoche)