Hi Guys After 12 Months Stuck On Codeine For Severe

Hi guys
After 12 months stuck on codeine for severe migraines i decided it was time to seek new medications non opiates for my migraines since i found myself starting to take the codeine daily amd in large quantities and not just for migraines but only if i was feeling down tired etc. Ive been off 2 days now and late day one about 16 hours after my last dose i woke from a nap terrified having an anxiety attack and ended up on the floor in uncontrollable shakes and sweats of which i thought i was going to die, my missis found me like that and called an ambulance and i spent the night in hospital with 2 bags of fluids put through me and monitoring. After the 2 bags of fluid i was still getting severe shakes so am on a couse of diazepam just to control that and restless legs for the next few days. My main questions are is it normal for such strong withdrawal to come on and even though highly anxious still and small deep shkes what are the chances im out of the worst of it?