What is this?

Since Thursday, strange things have been happening to me. My stomach seems to ache/get bloated at almost everything I eat. I poo at least 2-5 times a day. Nothing big, just little pecan size clumps. This all started when I got a headache and a flu and took some medicine on Thursday. I can't go to the doctor because my insurance needs to be renewed. Anyone have an idea what this could be?... Stomach flu, food poisoning, stomach virus, twisted intestines, appendicitus?