Let me save you a trip to the Embassy as I have spent a lot of time in various ones in various countries and they all say the same thing.

'We do not offer advice'. We can not tell you what to do.

So the following is a link from their webpage:

http://qatar.usembassy.gov/document_authentications.html

and basically it seems you need the State of Texas to authenticate it for you..

Authentication of U.S. Documents

We cannot authenticate a U.S. document. Nearly all U.S. documents are issued by local authorities in the U.S. and need to go through a several step authentication process.

First step: A document must first be authenticated by the local authority that issued it, such as a city, town or county. For academic credentials and degrees, the school registrar should execute an affidavit attesting to the validity of the document before a notary public in the registrar's office or elsewhere at the university.

Second step: The document must then be authenticated by the respective Secretary of State from the state in which the document was issued. Please visit the website for the Secretary of State of your state to learn how obtain the appropriate state level authentication.

Third step: Once a U.S. document has been authenticated by the state in which it was issued, you must then send the document to the U.S. Department of State's Authentications Office.

Fourth step: After the U.S. Department of State has authenticated a document, the document must be forwarded to the Embassy of Qatar in Washington, D.C.

Final step: You must take the document to the Consular Affairs Section of Qatar's Ministry of Foreign Affairs as listed above. Once the MFA Consular Affairs Section authenticates the Embassy of Qatar's seal and signature, your document is ready for use in Qatar.