ירמיהו ח:יח פירוש: רש״י

Were I to suppress my grief Heb. מבליגיתי, my suppression, and it is a noun, (mes estenimenc in O.F.). That is to say, if I said, I will suppress and keep in my grief.

my heart is sick within me From the voice of the prophecies that are revealed to me of the coming retributions.