Sharp/burning pain in right shoulder blade

Sharp/burning pain in right shoulder blade/chest area that happens in exact same area 1-2 seconds after swallowing water, food, air, etc. Happens every time and randomly started 4 weeks ago.

30 y/o female with history of GERD symptoms (never officially diagnosed) and history of 12 years of bulimia, sinusitis, burning back pain, hoarse voice, strong taste in back of mouth, throat tightness, and sore throat at times.

Also, what are white patches in back of throat?

Chest x-ray normal, bloodwork normal, will see GI doctor next week.