So I've been lightheaded, have abdominal cramping and bloating, constant diarrhea, loss of appetite, stronger heartbeat, get winded easily, chest pains, and it hurts when I apply pressure to my stomach. I've taken blood tests, urine tests, and they all came back normal. Found out I had mono though, but now my right side of my stomach is bulging out more. I had suspicions of being pregnant but there are 3 negative tests and I've had my period several times. They took an upper GI exam and found nothing. Does anyone know what the heck could be wrong? Or is this the mono messing everything up?