Jessie,
"and yes I always have cold hands and feet."
This means your metabolism is low and you have low thyroid hormone. This sets off a chain reaction of low body temperature, and low body temp in itself sets off another chain reaction of health problems. Low body temp problems is going to be my next report when I finish my work on Candida.
You could also be suffering a low body pH. Get a pH test strip (Amazon.Com) to measure your urine pH. It should be between 6.5 and 7.2 - if you are in the 4.x or 5.x area then you are a breeding ground for Candida & disease. A minor change in diet will resolve this problem. http://www.iconperformanceonline.com/?p=3678
Your body will have trouble digesting vitamins & minerals with a low Body pH. ( We are not talking about blood pH here)
I don'r have any opinions on liver & kidney flushes. My wife & I have never done them. IMO, these organs are self cleansing if we eat a healthy Paleo Diet.
You are most likely OK with your Vitamin D3 since you are out in the sun a lot. If you are in doubt, you can take the inexpensive blood test at home It should measure > 70ng/ml
At Home Blood Test: Blood should measure between 70 to 80 ng/ml http://www.vitamindcouncil.org/about-vitamin-d/testing-for-vitamin-d/
The ultimate reference guide is this book: https://sites.google.com/site/iodinereferenes/books/the-iodine-crises
I bought a dozen of these books to hand out to friends & neighbors which resulted in curing a half dozen people of their severe health problems. One was a terminal cancer case!
We also have well water. But we started using a water distiller from Amazon.Com because of farming chemicals seeping into the ground water.