1)
Why did he need consolation?
1.
Radak, Malbim: It is from what he was afflicted. Malbim - via this, Yir'ei Hashem will rejoice - "make with me a Siman for the good, so my enemies will see and be ashamed, for You, Hashem, helped me and consoled me" (86:17).
2)
What is "k'Imrasecha"?
1.
Radak: It is like You promised.
