perusing
dark circles under your eyes, hard bowel movements, coated tongue, and extremely poor circulation is definitely a sign of toxicity--
the eyes can probably be helped (if you're getting enough sleep) by a liver cleanse.
It sounds like your bowel isn't functioning well, so unless you're short on water or fiber, you might consider a set of colonics and take a colon cleanser to retrain your bowel on what a healthy bowel is supposed to do. the colonics should also ease the burden on your liver because if the toxins have nowhere to go they just accumulate and recirculate-- (probably a reason (but I doubt the sole reason) for the bad circulation) which is probably what's the issue with your tongue-- if the toxins can't go out the normal healthy routes, it's going to come out your mouth. Is it a clear coating or a white coating on your tongue? Is there a smell? Do you use a tongue scraper, and if so how long does it take to accumulate more crap on the tongue after a scraping?
I'm curious if you have hemmoroids? One woman (I believe it was on the colonics/enema page) that state she believed she had varicose veins solely due to having to push so much throughout the years to achieve a decent BM. I think the only issue that all of your problems come down to is a bad toxicity elimination in your body-- now, I don't know to much about veins or capillaries (keep in mind dark circles is leakage from the capillaries...is there swelling under your eyes and in your hands and feet by any chance?) My conjecture is that toxic blood keeps your veins and capillaries working triple time around the clock 24/7 and fighting the toxic blood means that the capillaries and veins slipup in other areas-- perhaps having blood leak in the under eye section, and definitely by only concentrating on pushing the blood around the torso to protect the body's organs. This second one is a pretty common survival tactic of the body that occurs in a range of unhealthy or accident-related situations.
but then again, sometimes people just have cold hands and feet. Anecdotally, it's genetic-- so I'd think you'd know if your family was the type that most everyone had cold extremities.
the sad thing is that there's so many individual chemicals and chemical interactions nowadays that you probably have a build up of some nasty little chemical (or chemical) though I really think that if you're really leading as healthy a lifestyle as you say, that you need to be going over your environment, food, and whatever else to figure out if there's some chemical that you're ignoring completely.
The order of cleansing is: bowel, liver, then parasite cleanse-- though individually some stages can be skipped or restructered.