I have had bloating,back pain,and the feeling of constant acid reflux for the past 24 hours. I am 15.?

Yesterday I ate lasagna for lunch, and immediately after felt very sick. I am very hot, but my feet and hands remain cold to the touch. I am having stomach pain that feels like acid reflux, but has not stopped for the past day. I was experiencing a sharp pain in my back. My stomach is bloated, but when I burp or p gas, the symptoms are only relieved temporarily. Today I have eaten toast and ginger ale. I feel slightly dizzy, and have been having minor diahria and nausea for the past month. What could be wrong?