1)
What is "carrying my flesh in my mouth"?
1.
Rashi: It is forcing myself to be silent.
2.
Malbim: I will bite my flesh with my teeth, amidst great pain, so my mouth will be closed and not scream. This is like one who is pained, he bites his finger to force himself to be silent.
2)
What is "putting my Nefesh in my hands"?
1.
Rashi: It is bringing my Nefesh to die amidst the afflictions of silence.
2.
Malbim: In any case, I am in danger of dying at any moment, even if I am silent - therefore, it is better that I speak.
