I am 32 yr old female with metastatic cutaneous melanoma. For the past month I feel very bloaded, my belly area feels sore, cramping, narrow stools, and today I saw some type of white mucous in my stools. My belly is big, it looks like if I am 4 or 5 months pregnant. I have been reading for colon cancer symptoms and I am thinking that the melanoma has spread. However I have not lost any weight, do not feel nauseaous, have not vomited, do not feel weak, my apetite is the same as before and I have another symptom that I haven't seen listed for colon cancer. I feel like if I had something inside my stomach(like water) and if I move I feel it move too. Does anyone know what this might be?