Yes chances are high that it was a serious bout of food poisoning. Some very basic bacteriology. Bacteria are grouped into two wide groups based on the colour they produce when stained with a dye called gram stain. There is Gram positive bacteria and Gram Negative bacteria. Majority of these bacteria produce toxins which harm the body's cells. Harmful bacteria found in the intestinal tract are Gram Negative. They produce endotoxins when they die. This is opposed to Gram Positive Bacteria which produce exotoxins when still living. What that last statement means is that even if you have been put on treatment, the bacteria die but continuously produce the toxins as they die. Antibiotics used to treat diseases caused by endotoxins may lead to an immediate worsening of symptoms but then conditions improve as the endotoxin breaks down. That is what you have been undergoing my brother. Keep taking the antibiotics. All will be ok. Even if you feel worse. Eventually you will feel better. While at it avoid salads as much as jguru avoids toyotas and always take properly heated food. However... taking food that has been heated after staying at room temps for long may not help because the bacteria will die but the toxins they produce will still give you a dose of poisoning. The toxins are rarely altered by heat. Habari ndio hiyo