I understand your exasperation and frustration, but the point I was trying to emphasize is that regardless of the quality of the diet, it is of no benefit if the body is unable to properly digest and assimilate it.
This means eating a quality diet only when genuinely hungry, which can mean just one meal per day. This makes a huge difference to health and elimination of waste in time.
You sound to be very anxious and stressed, and this will also add to your health problems by affecting digestion, resulting in toxemia, and therefore supporting the bodily ecology for your tumor to survive and thrive.
Please try and approach your health issues with a calmer frame of mind, as this will really help enormously.