Why did he say "do not hide Your face from me"?
Radak: My request is to see Your face!
Malbim: There should not be a hindrance from Your side - hiding Your face - nor from my side - that You would turn my face from You via anger. I.e. the depth of what I seek to understand should not stop me (Hester Panim from Your side), and not limitations [of intellect, or due to sin] of [me,] the one who wants to understand.
What is the meaning of "Tat"?
Rashi: He bent. This is like "va'Yet Shamayim" (18:10).
Radak: To turn and distract [me with worldly engagements], which are Af (anger) to one who engages in them - "v'Rahbam Amal va'Aven" (90:10).
How did Hashem help him?
Radak: You helped my bodily needs. Now that I request Your help for needs of my Nefesh, do not abandon me!
Malbim: You always helped me in matters in which my ability did not suffice, and I needed help. If so, also now do not abandon me!
Why did he say "Elokei Yish'i"?
Radak: Just like You saved me from my affliction, save me from toil of the body, and I will engage in needs of the Nefesh.
