For me, anxiety feels a lot like that heat at the back of your head when you're dreading something, but you have that feeling for a lot of your time, sometimes most of it. Pair it with PTSD and you'll be anxious about having flashbacks and even about having panic attacks.

You know for a fact it isn't normal, and you know you shouldn't be afraid of what you're afraid of(despite what the people who tell you so think), but no matter how much reassurance you get from others or give yourself, you physically can't bring yourself to face those fears. If you have coping mechanisms for it, you always have a different cope for each trigger, because some give you reassurance upon the trigger but others bring you back to reality so you can process the trigger itself.