Shiver symptoms and conditions

hey everyone i got a question... does this medicine cause any of you to throw up things you eat regulary? it did to me last night, no sleep, throw up, little shiver, headache that started in my forhead and eyes.. my eyes were heavy and i couldnt really see things were spinning below me and werent...now i have the headache in the top and a little back..when i get up from my bed or chair and my head goes down i get dizzy..oh my body feels warm yet no temp..plz someone help!! should i kall the doctor

I have been taking Keflex for the past two days, one 500mg dose every 12 hours, and I only had 3 doses total when I started having severe reactions. I had very sharp abdominal pain and cramping, then felt very hot, then very cold, and began to shiver uncontrollably, my hands and legs got tingly and then my legs began to have muscle spasams. These symptoms lasted for about 3 hours and today (next morning) they are better for the most part but I still have abdominal pain. I don't think I will take this drug again.