Hi,
Good for you on 4 days!
Just went through the 1st week myself.
Like you, I could not sleep and went to my Doctor for help on that.
It's withdrawl, not a fine feeling at all. Everyone has it a little different.
For me it's a reminder that I never want to go through it again.
Every day is a victory, no matter how bad it was, how bad you felt, how much you ate.
I hope it's gets easier for you, but when not SR is here.
Keep it up and good luck with this, sincerely.
Consider joining the Class of September 2013, most everyone there is under 30 days.