Any ideas what’s going on here
I can't say that I understand what's going on, but have you looked at kava kava? This herb can be very relaxing for the mind, and unlike benzodiazepines and other herbs which work on the GABA system, kava is not tolerance forming. In fact, it actually increases GABA receptor sensitivity over time. Kava is not available in Europe, but you can buy it from the US. This post lists some suppliers.
Also, N-acetyl cysteine (NAC) might be worth looking into, for its ability to treat the "wired" mental state. See this post:
Five ways to reduce your ME/CFS "wired but tired" hyperaroused brain state