Was I seriously ill or just mildly?

I had an attack of gastroenteritis. When I arrived at the hospital my BP was 180/70, my pulse was 120, and I was shivering so violently I could not walk. I lost feeling in my hands and feet. Is this a normal progression? They put me on a drip immediately and put a liter of Ringer's lactate and two of saline into me, along with 2mg of Kytril (Granisetron), dramamine, omeprazole and Nexium to stop gastric erosion of my oesophagus. I rapidly stabilised, but five days later I am still sick and weak and tire very easily. I've never taken this long to recover from food poisoning and it's worrying me. I have lost almost 5kg and am now borderline underweight, but food nauseates me.