The stomach issues, headache, and flu-like stuff will gradually get better over the next few weeks, sleeplessness and anxiety will hang around for a time. Immodium can help with early withdrawal...you may want to look into that.
I'm 4 months out and feeling pretty close to normal. Still have some depression, but I think that's one of the reasons I started using in the first place.
You can do this...their will never be a better time.