Intrusive Thoughts

I think i have Intrusive thoughts it's not the kind you sometimes see on social media "oh my intrusive thoughts won" no like I once was just putting away washed dishes and I held a knife and my thoughts just tell me to stab myself and my parents. I looked at a child just looked i felt nothing and my head told me I'm a pedophile now. I often think of just killing my family throwing myself suddenly infront of a train even tho I have a good day. About destroying stuff that are very dear to me like my comfort items that I'd genuinely die for like genuinely. And there is more hurting people and such stuff. 

I can't do it anymore I hope my ADHD medication will help I heard if you take it you can just think of nothing that sounds really cool. I'm afraid I will maybe do something to myself or other people if my intrusive thoughts win.