Do you think that i have a case for damages in this matter?

i live in the state of Tennessee. A few years back i got with this girl and she inevitably became pregnant. ever since she found out she had named me the father. i was with her through the entire pregnancy and became quite excited about having a child. the child was born and the voluntary acknowledgement of paternity was signed by both her and i. the child will be 2 years old next month. ive grown so attached to her and loved her. she never sought child support but the relationship failed. recently she has accounted for her actions and is now claiming i am not the father. i am devistated. cannot sleep cannot eat. she refuses to let me see the child. i am not vindictive by any means really but i think she should have to compensate me for all im going through. its very hard and has affected my schoolwork and everything with bouts of depression. i am asking if suing for mental anguish is just and not frivolous. i dont see why it could be because she signed a sworn affadavit naming me as the father. i love the kid and id do anything for her but she has moved on in her life. i am still stuck sitting here with so many questions and so much pain. i gave that girl everything i could and now im being told its for nothing. she never had to work or pay for anything. i know i cant be compensated for what i willfully gave, but i think that i should be compensated for all i have and am enduring over this horrible cirstance. so do you think i have a case? or can anything be done.