Vitamin D is extremely important in helping maintain the balance of calcium in our bodies. In fact, that's the most important thing that vitamin D does! Vitamin D has a direct effect on the intestines and encourages the intestines to absorb calcium from the food that you have eaten (this is why most milks are fortified with vitamin D). Vitamin D also has an effect on the kidneys and tells the kidneys to not let any calcium escape into the urine. Therefore, it is possible for a person to take too much vitamin D so that they absorb too much calcium from their diet and hold on to too much calcium in their kidneys... and their calcium goes high.
Each user experiences their own unique feelings when using steroids and coming off the drug. When someone chooses to stop using they can experience a variety of withdrawal symptoms linked to addiction. Symptoms can include mood swings, fatigue, restlessness, loss of appetite, insomnia, reduced sex drive, the desire to take more steroids, and depression. Evidence for steroid addiction is certainly not as strong as it is for other drugs like cocaine or heroin. Though it is clear that people develop a tolerance and dependence on them and willingly experience negative consequences when using steroids - both of which are signs for drug dependence.
Mild symptoms of high levels of carbon dioxide in the blood include flushed skin, muscle twitches, elevated heart rate, shortness of breath and minor mental impairment such as confusion. Moderate symptoms of hypercapnia include lethargy, panic, dizziness and excessive sweating. Severe symptoms of carbon dioxide poisoning include unconsciousness, seizures, coma, respiratory arrest and death. The longer the individual goes without treatment, or the longer the exposure is to an external carbon dioxide source, the more severe her symptoms become and the faster her medical condition deteriorates.