I have been concussed for about a year and an half, and I have similar symptoms. Although anxious thoughts sometimes make it worse, I have trouble swallowing. I also seem so have liquid go "down the wrong tube" more frequently than before the injury. After I try to cough up the water, my throat does seem to hurt for a little while. After my MRI I was diagnosed with whiplash. Do you have any tension in your neck or shoulders? Maybe it is neurological, but it definitely could be due to your spine/neck area. My whiplash is getting better, but just like a concussion, it takes time. I'll pray that you will heal soon.
-Josh