Hi British Beef,
Welcome to Healing Well! My guess is that feeling of heartburn is the residual damage that was done in the first place. I suggest you are very careful about
eating, and don't eat anything that is at all rough.
I've experienced similar issues due to severe reflux, when I have burned my esophagus and it has taken many weeks to heal it. Unfortunately, it takes a long time for this healing to occur, and your careful eating will have to continue until it's better.
If you can get it in the UK, there is a great prescript
ion med here called Carafate Suspension. It coats the esophagus and helps protect it as it heals. You could at least ask and see if it's available, or if there is something else similar that you can get.
It is probably known there as Sulcrate Suspension. I take the strength 1G/10ml. It's also available in a pill form, but that's more for the stomach. I have put the pill into a little medicine cup and mixed it with a bit of water, then threw it down, but the suspension is a better way to go.
I wish I could give you a quick-fix answer, but I can at least tell you that what you are experiencing is not unexpected. When you have severe reflux for a period of time, it can cause esophagitis, which takes time to heal.
Here is a link that you might find informative:www.medicinenet.com/esophagitis/article.htm
Best wishes! Try to be patient and eat very carefully. I know it isn't what you want to hear, but there's just no quick answer. That type of tissue takes a long time to heal.