Irrational Fears

I keep fixating on random irrational fears for months on end until I find something else to fixate on. I cant even tell anyone because Im so scared that saying it will make it come true... last months fear was sleepwalking, and that Id hurt myself or someone else. Ive never sleepwalked In my life so where has this come from? My current fear is so bizzare and so unlikely to happen yet here I am obsessing over it. I really worry I could have OCD, but Im under so much stress at the minute. Ive lost a number of people to suicide in the last year, Im currently a student living away from home, my friends are moving out without me, I have no money and Im becoming more and more depressed. I feel like Im drowning and dont know what to do.