Mixed feelings

Went to the doctor yesterday and he is going to help me get pregnant. He said that IUI is the best option with a donor sperm. I am fine with that but I am so feeling not myself. Ever since yesterday, my nerves have been killing me. I am not feeling myself. I am impatient. This whole process is killing me because all I want to so is get it started not go threw testing and then having to wait and then start. I want to start now. My nerves are literally threw the roof!!!! I am also worried that this will not work. I am very hopeful but I heard others say it can take 2 or more cycles. I already been threw so much heart ache, hearing that it can be longer than what I was told will tear me more. Who has gone threw this?