This has happened three times now, it isn't a super abnormal thing not to respond and I understand that. But my brain takes certain events and it always twists it around to make something horrible happen and then I'm stuck with that.. Horrible..? Feeling or something like that. 
Like, my friend has anxiety issues and told me that when I accidentally didn't reply it was really triggering to their abandonment issues. I replied to them apologizing refusely, and now they haven't replied to me for hours and my brain is freaking out, giving the same feeling that feels extremely real that something bad has happened to them. 
I want to text them and make sure they're alright I already texted some people they know and I hate bothering them I'm just really worried for no reason. It's so difficult to discard it and I am really scared.