Take a look into high histamine. K2 is probably having an excitatory effect and adding to it. I am precisely preparing a supplement combo for myself to address histamines (B2+B6+minerals). Low carb paleo diets are very high in amines.
Interesting!! When I started low carb paleo in 2014, it saved me from myalgic encephalomyelitis. muscle pains, weakness, etc gone. At that time, I had my DAO measured before and after, it went from 7.2 to 42 kU/L (normal: >10). But even more convincing than labs, I started tolerating high amines foods such as ripe fermented olives. Ripe olives is really the top of lots of amines. Before, impossible to eat, I tolerated only green olives. In brief: while low carb paleo may be high in amines, my free capacity to degrade them increased 6 times. Our genes are essentially identical with that of stone age people. In lack of fridges, they fermented everything. So, we must be well prepared to eat tons of amines contained in fermented foods. Unless something kills this ability in us. Leaky gut f.ex. decreases DAO so much that researchers are using it as an index for leaky gut.
http://www.ncbi.nlm.nih.gov/pubmed/21225906
Btw I tried also all kinds of supplements, designed combos like you do, etc. My "supplement cemetery" contains over 100 pieces!!

Seriously. Some helped a bit, some harmed a lot, none solved anything (one exception: B12+natural folate saved me from brain fog. Thanks Rich Konynenburg's paper)
(I do not write this to convince you of anything. Everone's problem is different. This is just my story, and also that of Chris Kresser, the paleo doc. He was sick for 10 years, also tried tons of sups, tells the stories about his "sups cemetery" and paleo solved then the issues)
Hey you know what???? Just writing this text it comes to me: You are right, this is damn histamine!!! I had anywise noticed that I had palpitations during the last weeks. I did not make the connection w/o your help, but I just went so crazy high in my favourite ripe olives brand (super tasty Greek olives mmmmmm

+ listening some Zeibekiko to it

). I mean, earlier I could not eat more than 1 ripe olive, so now I enjoy it to the fullest...

Today I had the absolute top of some 300g. Imagine 300g of ripe olives!!! I can eat this stuff like others drink water. Well I think I can, but my body apparently does not think so....

) I make a trial the next days, reduce olives to normal amounts.
Thank you thank you thank you for opening up my eyes!!!!! Can I give +100 likes???