Verge, the feeling of neurosis should subside greatly if you can make it 2 weeks to a month without the herb. At day 4, I would say your right in the middle of the storm. The hardest part of the withdrawal is typically between 1 and 3 weeks. And it takes about a month for the weed to get out of your system.
Don't worry, I felt the same exact way when I quit the first time (I've had several quits). I thought I was going to be insane the rest of my life. It does get much better. When I think back to how I felt when I first quit, I get shivers of just how messed up I was in the head.
My advice would be to drink plenty of water and/or cranberry juice if you got it, exercise, taking hot baths is good, and try to eat healthy. Sleeping was really hard for me, so I tried to exhuast myself during the day by exercise etc.
Looking forward to hearing from you and I will say a prayer for you anyways