Ed,

To answer your question, yes it does get better. I am virtually back to normal apart from still having headaches and fatigue. You will get better too, but its very early days for you, you need to reduce demands on yourself and relax.

The fact that the MRI is clear is good news. The problem is head injuries can still take a long time to get over, you are going to need lots of quiet rest.

I know it is difficult, but stop worrying you have a concussion not a permanent brain injury. Anxiety only increases the symptoms of PCS. Many users of this forum, myself included, have been helped by antidepressants. As well as improving mood and anxiety, many also help reduce physiological symptoms in turn, reduce pain and improve sleep.