I understand your dilemma.
Most likely your initial symptoms were indeed MSK or pinched nerve related.
However, you are describing a burning pain with activities with imprvement on lying down.
This can be still reflux related --most likely biliary reflux or non acid refluxx disease.
PPIs do not help in that case.
However, you can try ranitidine as a step down therapy from PPI to avoid withdrawal symptoms.
Biliary reflux improves with bile acid sequestrants like cholestyramine.
Baclofen also has been used with non acid reflux disease also known as functional dyspepsia.
2. regarding your < 2 cm pancreatic mass --that sounds like benign as with most cases.
However, a MRI scan of the pancreas can be considered for further evaluation to monitor any increase in size.
Colonoscopy is not necessary as such.
It was my pleasure to help you today.
I am Dr Basu experienced in Metabolic Diseases.
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