Hi Jacqui
I'm sorry you are having yucky side effects. I haven't taken xeloda but had oesophagitis initially on my current treatment. I did have a dose reduction but that was more to do with my blood counts. We got my oesophagitis under control with nexium - I take 20mg morning and night - this worked better for me than 40mg once a day. I also take Nizac with it (I think this is similar to Zantac) - this was recommended by the pharmacist and does seem to keep it under control. (Mine was so bad I had internal bleeding) I also take an antifungal for internal thrush - can be associated with the burning.
If you are intor trying some natural alternatives - drinking slippery elm can help to coat your oesophagus and intenstines before your eat. Sitting up in bed as has already been mentioned may also help.
With the symptoms you are describing I would be getting in touch with either your GP or oncologist - whichever you have the better relationship with to try and get the side effects under control.
Take care,
Amanda xx