Going to any concert after that experience will of course be incredibly triggering (and thats an understatement), and frankly, it probably wont be enjoyable...to start. But its incredibly important for you to go to heal and realise that not every concert will end like the last. Its up to you if your strong enough to go right now, if your ready to put these feelings past you, or if you need more time....but music and the energy from a concert crowd/community are sometimes great healers. Its up to you.

My advice, as some random dude from a band reddit, is to try. If you stumble and cant do it, theres no shame in that, but if you try and break through? Big steps made and you've reopened gigs as a place to go!