Re tube: I was given some gauze pads w. slits to put under the tube. When these ran out I just cut as slits in regular gauze squares. I tucked them under the tube and taped them to themselves as I also had reactions to the adhesive tapes. If I didn't have to be in public I wore gowns and just lifted them up for feedings or used snap up model coats and zip up robes. Other wise I wore skirts w. elastic waists and either let the tube dangle outside w a long shirt or jacket to cover it or tucked it in and only took it out for "feedings."
RE "not in group": There is more advice in the insurance forum but will say here that it is best to call your ins and also write that you are trying to keep all your cancer related care coordinated at one facility. There should be some type of help available in the hospital for this.