I am 3 years post MVA . I had the same problem - not being able to verbalize my thoughts but could write them down - I would take written lists of my symptoms to every appt and some days I could not even read them off - I'd just hand the list over to whoever i was seeing that day. This took 2 years to resolve (please don't get depressed over that!) But it did get much better and now I can communicate verbally even when I am suffering from a flare up of symptoms.

My occupational therapist explained alot of the PCS symptoms and how best to cope with them. That also might be a good source for finding a good support group if you don't have a local brain injury association.