1)
What is the meaning of "Nafshi v'Chapi Samid"?
1.
Rashi: I was in many dangers, close to death.
2)
Does "v'Sorasecha Lo Shachachti" connect to the beginning of the verse?
1.
Rashi: Yes - even though I was in many dangers [Malbim - due to wars, and this harms investigation 1 ], even so I did not forget Your Torah. If one's head hurts, he should engage in Torah (Eruvin 54a).
1
Malbim: Even so, I engaged in Torah constantly. Also above (61) "Chevlei Resha'im Iveduni [Torasecha Lo Shachachti]."