Extremely Anxious Overseas

Hello, I am a 17 year old male currently suffering from extreme anxiety that seemingly came out of nowhere. To start, I have been suffering from Pure O OCD since I was in ninth grade, and I have been suffering from derealization and depersonalization since I was in 11th grade. Currently, I am in Brazil with my older brother living with my dad, (who I haven't seen in years). Before the trip, my anxiety was under control, to the point where I didn't have an anxiety for days at a time. Now, my anxiety has become extremely severe all of a sudden, to the point where I am afraid of even leaving the house. I can't sleep, my intrusive thoughts have returned, and I'm just overall anxious all the time for no reason. If anyone has experienced anything similar and gotten through it please let me know any helpful tips, as I want to be able to enjoy this trip without being anxious all the time. Thanks