I've mentioned some weird health problems I've had lately a couple of places on the forum. They were seemingly brought on by taking a small amount of a supposedly innocuous vitamin, called vitamin k2 (menatetranone). (funny that it's called "vitamin k"...)
What was weird about this vitamin was I noticed it immediately made me feel great and full of energy. What's more it seemed to increase my ecstatic conductivity. My pranayama was super-ecstatic, as was kechari, and other mudras/bandhas.
Everything seemed great until I started noticing that my heart was palpitating and my usually low-normal blood pressure was through the roof. I could also see some veins standing out in a creepy way I hadn't noticed before, so I stopped taking the vitamin. Right around that time, I also developed a retinal hole, which doctors tell me probably had no vascular cause, but which I have trouble believing them about. Since then, I've had a ton of floaters and a shimmering spot in a corner of my vision that worsens with exertion. When I do a back bend I see lightning bolts in my vision (seeing the veins in the eye), like too much blood is rushing to the head.
It makes me think back to my initial "awakening" (or my first experiences with ecstatic conductivity, at least--I'm not sure my kundalini is advanced enough to be called "awake"). One thing I noticed besides a big catharsis of emotions and a sudden appearance of ecstatic feelings during meditation and sometimes during the day, was that it seemed like my blood circulation had changed somehow... like it had become more "mobile." Like, if I stood on my head, a lot more blood would go to my head than usual. For a little while after my first awakening I even had trouble with cardiovascular exercise because it would make me feel faint. It seemed like I wasn't getting enough oxygen or something--or like the newfound energy and ecstasy was burning it up faster than usual and demanding more, or something. I remember feeling especially ecstatic when I'd take a hot shower or bath, because the tingly feeling of blood vessels expanding on the skin was intensified.
I also remember a period a few years ago when I first developed floaters, which corresponded to an increase in ecstatic conductivity and probably a little overdoing of yoni mudra kumbhaka. These fortunately went away on their own.
Anyway, now that I think about it, the symptoms caused by this vitamin k2 (WARNING: THOUGH IT INCREASED MY KUNDALINI, I AM NOT RECOMMENDING ANYONE TAKE THIS VITAMIN--IT'S TOO RISKY. IF YOU WANT TO TRY UPPING YOUR K2 LEVELS, JUST EAT SOME GOUDA CHEESE OR A BIT OF NATTO) are very reminiscent of the symptoms I first got during my initial energy "awakening," none of which ever caused real problems until now, with the eyes.
It makes me wonder more generally about the relationship of kundalini and prana/qi to blood: in TCM they say "qi leads the blood," meaning that where energy goes, blood follows; as a corollary, where blood flow is increased, energy flow tends to increase. I think this part of why Yoga so loves the headstand.
Related, Yogani has, of course, mentioned how "holding back" something (like oxygen) can cause a compensatory boost in energy (as with kumbhaka). I've never dared to try this (and don't plan to, and don't recommend it), but I'm pretty sure the reason kumbhaka works is related to the reason people do erotic asphyxiation (people claim strangling themselves during sex or masturbation intensified the pleasure, and several people die each year as a result). I wonder if it might not also be a case of me just suffering from some kind of periodic anemia or blood problem, possibly exacerbated by the vitamin, which causes me not to get enough oxygen, which I mistake as a good thing, as my kundalini gets riled up in compensation?
I wonder, though, is there any risk to all this? I'm not saying kumbhaka is equivalent to erotic asphyxiation, but where I used to just think "more blood flow=better," I've lately come to realize that, as we age, we don't want to put too much stress on our blood vessels--it can lead to varicose veins or worse (Swami Vivekananda died at a young age of a ruptured blood vessel in his brain, and Yogananda also died rather suddenly of heart trouble, if I'm not mistaken--I'm not saying Yoga was the cause, but it does give one pause...).
More generally, have others noticed similar connections between blood flow and kundalini expansions? Is there a way to safely push the envelope without increasing risk of scary problems? Thanks for any insight or experiences.