I certainly feel for you ~ it gets beyond frustration doesn't it!!
I searched from one side of the world to the other and my search from beginning to end was nearly 7 years. Many times I wondered if it was worth it....gosh, when I think of all the time I used to spend on the computer I feel quite exhausted!!
But, sometimes good things come to those that wait...I was one of them. I finally made contact in April 2003...and my contact resulted in a complete bio family
My birthmom and birthdad went on to marry 5 years after relinguishing me ~ reunion bought me not only my birthmom, but birthdad, a full sister and two full brothers......not to mention the extended family!!
I know when I was in the throes of searching I would read others story saying hang in there, don't give up and I used to think yea, sure...it happened for you but it won't for me...and then look what happened!!
Its very easy to become discouraged, very easy to say thats it, I have had enough...but as so many of us know there is still this desire deep inside to keep on going until we get some answers and so we do keep on going...frustrations and all.
I will cross my fingers for you and send all the positive energy I can in the hope that one day you will find the answers.
Good Luck!!!