1)
Why did he say "Al Tirchak"?
1.
Radak: When You see these afflictions come, do not distance, for You are my strength, and I trust only in You.
2.
Malbim: Stand close, ready for salvation. "L'Ezrasi Chuashah" is zealousness to save.
2)
What is "Eyalusi"?
1.
Rashi: My strength. This is like "Hayisi k'Gever Ein Eyal" (88:5) and "Yesh l'El Yadi" (Bereishis 31:29). Malbim - it says Eyalusi, for it is like Ayeles ha'Shachar.
