I Have Been Digionesed With Noncancerous Thyroid Noduels. Can They

I have been digionesed with noncancerous thyroid noduels. Can they cause problems even though they are benign. I am having problems with no appetite and nervousness and I get cold very easy and the blood workup they did on me t3 t4 shows everything is ok. I am now having depression because I feel so weak and tired and nervous. What do I do??