Hi Cherub
Are you allowing yourself to become completely 'empty' between eating?
The 'tomb smell' is when the stomach is empty. Unless you already do so, try and space your eating out more evenly.
So meal, fruit, crispbread, meal, fruit etc rather than meal, meal, meal.
In the first couple of weeks on the program, I got into the habit of spicing the food, and found that curry powder in particular left a shocking taste in my mouth, couldn't seem to shift it. Considering that I was using the barest amount of spice it took a while for me to realise, and it was because I was frying the spice in with the meat.
After that, and once I got into the habit of the casseroles, I didn't have the problem again. I made sure that the dried herbs in the casseroles were mainly oregano or parsley, occasionally chilli flakes, but avoided curry powders, dried ginger or other pungent spice.
Also, if you are not doing the yoghurt breakfast, perhaps you could start as the yoghurt is very good for digestive health.
Hope this helps
Chelsea