For second week I feel nausea, some light stomach ache or burning feeling in stomach, loss of appetite, almost every day for like one week I have loose or watery stool 2-4 time per day. No fewer, no temperature. Now on the second week I start to feel a bit better, start to eat light food and feeling more better. I?m 35 without any previous medical history. What it could be? Cuz if it?s stomach infection could it last for 2 weeks?