Why does the verse begin "Ya'an Shachacht Osi"?
Malbim: The primary reason why all these [punishments] came to you is because you totally forgot Hashem, like a Zonah who totally abandoned her husband and forgot him.
What do we learn from "va'Tashlichi Osi Acharei Gavech"?
Brachos 10b: "V'Osi Hishlachta Acharei Gavecha 1 " refers to one who eats before praying. We read this "Ge'echa" -- after acting haughtily, you accept Ol Malchus Shamayim?!
Radak: This is like one who casts something in back of him, lest he see it and remember it.
There it learns from a very similar verse; presumably, also our verse teaches this. (PF)
How will you carry your Zimah?
Rashi citing Targum Yonasan: You will receive liability for your counsel of sin.
Malbim: Just like I bore shame due to you, you will bear the punishment for your Zimah.
