Could improper swallowing and breathing coordination damage the lower esophageal sphincter or the esophagus itself? am having gerd symptoms since i began overthinking my breathing and swallowing. could i be causing damage by swallowing too hard?

It is not feasible to provide an opinion without additional history, physical examination may be some tests. It would be prudent to see your doctor to see if you may be depressed. Depression is treatable. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!