You should visit with an orthopedic hand doctor. If it’s really an entrapment, it didn’t start with you playing a dreadnaught, it was probably there to begin with. It is likely that whatever changed in your posture when you switched guitars irritated the nerve and caused inflammation.
I’ll tell you what I’m 90% sure your doctor would tell you: rest, ice, stretching. Possibly physical therapy if the pain persists.
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1943 Gibson J-45
Martin Custom Shop 000-28 Authentic Aged 1937
Voyage Air VAOM-4
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