Psalms 23:4 and being scared

Yea, though I walk through the valley of the shadow of death,
I will fear no evil; For You are with me; Your rod and Your staff, they comfort me. - Psalms 23:4

This verse has always comforted me. I can remember being 5 or 6 and waking up in the middle of the night, scared to death because I had a bad dream. Of course I went to my mom and told her. She reminded me that I had just memorized this verse in AWANAs and told me that I should pray this verse to myself (if that makes any sense). If helped me fall right back asleep and I usually don't fall asleep very quickly after I get scared! Ever since then, this verse has stuck in my mind and whenever I am afraid, it pops right back into my head and I remember that God is always with me. Which is the most comforting thought in the world.

Tomorrow I am going to get an ultrasound because there is a lump on my breast. I am very scared. And I know the chances of it being cancer are very, very low, but Satan has a little voice in my head that keeps telling there is still a chance that it is cancer and it scares me to death. I had kept this to myself for awhile, because I am a private person. After I made the appointment, I told my mom and sister about it. And then last night, I told a friend (Amanda) who in turn told other girls in our community group. I was too afraid to actually tell them myself. Yesterday was hard, I was scared, worried, upset, etc. But after I told Amanda, I felt at peace. And then today, Psalms 23:4 came to mind. Just in time to comfort me and give me peace. I'm still scared, how can you not be when you don't know what it is? But I know God is there and will help me and Eli through this time, no matter what happens.