Ignored and angry. Should I bring up the notion of tube feeding or TPN with my doctors?

Malnourished. If you feel that you have inadequate nutrition, then you should certainly discuss these options. Certain conditions require supplemental nutrition or fluid such as malnutrition, dehydration, pancreatitis, short bowel syndrome and certain cancers. Your doctor should be able to tell you if you require supplementation. If you are frustrated, it is ok to search for another opinion.
Question is confusin. You should always bring up any issue about your care that you find confusing. If the drs seem too quick to come or unready to discuss things, send word thru the nursing staff/ charge nurse that you have these concerns & they can make sure those involved get the message.