Try setting yourself small goals like finding a shortish run that can be crowded but you can get off if needed. Try it at your normal pace and when you finish it think about how you managed. It may take a couple of false starts but as you a achieve the goals, set new ones that are a little bit further outside your comfort zone.
If things persist, some cognitive behavioural therapy may be helpful. It's very a very practical approach to managing anxiety that doesn't involve lying on a couch or anything too touchy feely. It can give you strategies to get on top of negative sensations when they start to well up.
Monty Python's version of the cougar phenomenon:
"This is a frightened city. Over these houses, over these streets hangs a pall of fear. Fear of a new kind of violence which is terrorizing the city. Yes, gangs of old ladies attacking defenseless, fit young men".
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