What is the meaning of "Hirgaztani"?
Rashi: You scared me. Radak citing Tanchuma Emor 2/4 - I thought that this is the day of judgment, and I am being called for judgment.
Radak: You disturbed my rest.
How did Hashem veer from him?
Targum Yonasan: Hashem's word veered from (did not answer) him.
Malbim: There was a Divine spirit on him, like "va'Titzlach Alav Ru'ach Elokim 1 " (10:10) - a spirit of Gevurah and courage; it left him, therefore he was afraid.
Surely this is the correct text. "Va'Titzlach Alav Ru'ach Hashem" was said about Shimshon (Shoftim 14:6)! (PF)
Sha'ul also tried asking the Urim v'Tumim (verse 6). Why did he omit this?
Rashi citing Brachos 12b: He was ashamed that he killed Nov Ir ha'Kohanim.
He asked through dreams before through Nevi'im (verse 6). Why did he reverse the order?
Malbim: He was ashamed to say that he slackened from preparing his heart to seek Hashem [and did not ask from the most Kadosh source first, rather, from the easiest, which needs little preparation].
What is the meaning of "va'Ekra'eh Lach"?
Rashi: I called out to you [so you will tell me what to do]. This is like "Nikro Nikreisi b'Har ha'Gilbo'a", "v'Sham Nikra Ish Beli'ya'al" (2:1:6, 2:20:1). Radak - we often find a Hei at the end, e.g. "Eshme'ah", "Eshmorah" (Tehilim 85:9, 39:2). The Segol at the end is uncommon, but we find also this - "Yedashneh Selah" (Tehilim 20:4).
