Apparently the heartburn is caused by the anti-inflammatory, Diclofenac.
They send you home with Morphine, which pretty much always causes constipation and sickness, but nothing for the side effects.
They send you home with Diclofenac, whose continued use causes stomach and esophageal problems such as ulcers, but nothing to protect the stomach.
I mean, there are side effects which are unlikely, and side effects which are pretty much guaranteed. It would have been nice to be a bit better prepared for the latter.
It feels like it's side effect after side effect at the moment. I'm hoping the protein-inhibitor I've now been prescribed will make it possible to eat soon and actually enjoy food. Until then, I will probably sulk. :-/