Not completely sure if it’s an autism thing but anyone got advice on how to stop creating worries over my own body and movements?

Like if I my finger moves for like half a second on its own, my first thought is I’m dying, or I hear my own heart beat when I’m trying to sleep and I assume i must have heart disease or I lay on my back and feel the pressure of the pillows hit my neck and my neck moves to adjust so I feel like I must be dying of smth like that, lately I’ve noticed the neck thing a lot which has accidentally caused me to feel like a bobblehead ill just be standing g up straight not moving than I’ll think “oh please god don’t let my head tilt slightly” than it happens and I just assume I must be dying or I need extensive surgery, I apologize if this is more an ocd or anxiety thing