1)
What Refu'ah does he request?
1.
Radak, Malbim: It is a Refu'ah from the Makeh and the pain, like he said "Che'evi Netzach u'Makasi Anushah" (15:18). Radak - the pain and the Makeh are the disgrace and the curse. Malbim - he requested that he not prophesize more punishments.
2)
What is the meaning of "Sehilasi Atah"?
1.
Rashi: I boast and glorify myself through You, to say that You are my savior.