My Spanish level is intermediate however, I am confident about these.
(1) tener dudas = to have doubts
(2) aclarar mis dudas = to clear up my doubts
e.g. I had many doubts (tenia muchas dudas) about my ability to work in this career; however, during our chat, you cleared them (i.e. the doubts) up for me (les aclaraste), and I feel much happier now.