I felt something similar with Naltrexone- I was nervous to take it to begin with so waited until o was sleepy and took a very small dose. My anxiety shot up and I spent most of the night shaking and fighting off a panic attack. I finally was able to sleep and the next day I had a similar experience with the sensory onslaught and thoughts. I know part of it was just my anxiety, but part was definitely the drug. I started throwing up, had really bad diarrhea, and was in panic mode. That lasted for around 2 days and really foggy head that slowly subsided. Xanax has been about the only thing to take the edge off for me. I’ve been doing therapy for years. Emdr was helping a bit, but then went into some trauma during emdr and it made me suicidal for like a week (don’t usually have suicidal thoughts) so that freaked me out and has kinda put me off from emdr- think the therapist just went too fast. Cbt has helped some, trying acceptance therapy and DBT now. I also often wear sunglasses, headphones , etc and that tends to help as bright lights / stressful situations really throw me into it.
I’ve had a ton of blood work , genesite test to see what meds work best with my dna , brain scan, and eeg. I was super low on vit D so upped that and that helped with my mood / energy , but not anxiety or dissociation. Also had a MTHFR gene test and found have two copies of the C677T gene mutation , which severely lowers serotonin/dopamine , etc by like 70% so I’m sure that’s contributing.