Also try more natural products like pure aloe vera (buy a plant and use the flesh) and coconut oil. Both are good for various skin conditions. I tend to find AV is good to help repair, Epaderm as a barrier.
Interesting Dave because I have had some very tight chest pains during/from hard racing and the odd session in previous 16 months. Ruled out costo, asthma, heart disease etc. I'm currently on a PPI for what they first believed was barratts oesophagus, although on second gastroscopy they are "not convinced". Severe acid reflux as you know (from reasearch) 'can' cause chest pains but has to be quite severe and you'd probably know you had acid reflux if it was hurting that much.
All I can say is its a lot better this year. I have changed my diet a little to cut out chances of acid indigestion, although the pain is more mid throat and not typical symptoms. I use a wedge to sleep on at night in case anything was happening then.
Other possibility is its some kind of nerve damage or aggravation.
Sorry can;t be of more help, but just to let you know that particular running pain seems to have gone now. May take some time if it was actually a nerve aggravation.