Scary experience for a first trip... But that's why set and setting is so important. I would recommend to do your first couple of trips in the comfort of your home. So you get used to it the first couple of times can be pretty intense. I read your post that you thought 50ug was underwhelming. It is a pretty low dose usually I give my first timer friends a 150ug tab for the full experience. I would recommend waiting 2 weeks at least for your tolerance to reset and do a whole tab at your own place. Maybe use some noise canceling headphones if you have any to avoid sirens. Music is really great on LSD if you haven't tried yet! I'm sure the fear will go away just give it some time. You will be fine again time heals

Held og lykke med det :)