In my experience primary withdrawal (I want to die stage) will last 5-7 days with secondary (anything you feel catch-all shit) withdrawals lasting up to 2 weeks. Try to medicate the symptoms as best as possible. Blood pressure is probably high, your muscles may be cramping, diarrhea, dehydration, restless, anxiety and morbid thoughts. I don't know where you are from, or what your access to a medical detox might be, but it would be much more comfortable than what you are going through now. So...blood pressure meds, muscle relaxants, anti-diarrhetics, nausea meds, anxiety meds, and drink lots of water and take hot showers. Anything listed that you can do will help but be advised that self-medicating is always risky. Good luck.