Alan Pitts is a professional researcher, and I have found him to be very good. He found information about my GG Grand Uncle that others could not. He is one of the web Masters for this web site as well. His e-mail address is: email@example.com
You may want to try the Library of Virginia. It is the official archive for the State of Virginia, and since the 38th GA spent most of the war in Virginia with the Army of Northern Virginia, you may find something here. If you do a Google search, their web address will come up. I do not have that site at my finger tips. This is one of the best and user friendly state archives I have seen. In addition, I have found casualty list in the Richmond Daily Dispatch. This was a Richmond newspaper that is now on line. It's records were not destroyed after the war and it is indexed by date and each issue is indexed as well. It is all on line. One thing the CSA did after a large battle was send the wounded to many different places for treatment. The Daily Dispatch list by name, unit, and hospital. You will need to look at the dates of the battles and then search the newspaper for a story. Many of these battles did not have a name by the time the report was in the paper and they are called by location and it may not be the same as the names we know them by today. One problem with finding CSA graves, If the army had to retreat before it could remove their dead from the field, the federals just dumped Confederate bodies in mass graves. If your GG Grand father died at a hospital, there may be a record of where his final resting place is. Good Luck in your search.
Dr. Robert Massey
El Mirage, AZ