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The older you get, the less able your body is to repair the daily damage caused by such megadosing and to keep up with the necessity of purging all of the excess.

Right now, the study of the effects of chronic overdosing of vitamins and minerals is a relatively new area. The preliminary results seem to be that such practices are harmful; I expect future and on-going studies to better establish and document what exactly happens to people who chronically overdose on vitamins and supplements.

The nutritional supplement industry is Big Business, make no mistake about that. They sell their products by downplaying the fact that your body does not need huge excesses of vitamins or minerals, it only needs enough, which (in most cases) is found in a balanced diet. According to Forbes magazine, the nutritional supplement industry pulled in $32 billion in profits in 2012, and is expected to top $60 billion by 2021. http://www.forbes.com/sites/davidlariviere/2013/04/18/nutritional-supplements-flexing-their-muscles-as-growth-industry/
That is a huge business—of course they have strong financial incentive to keep convincing people to buy their products even though the science just isn’t there to support the practice.

I strongly suggest tapering off the vitamin C. Chronic megadosing throws off the body’s normal homeostatic mechanisms that keep the blood concentration of vitamin C at a constant level. Tapering off the megadosing will allow that system to reestablish at normal levels. You can get all of your vitamin C requirements by eating an orange or two every day, and oranges are a heck of a lot more tasty than pills.

Since you call yourself Black Agnes, I assume you are a black woman. In that case, you may need to take vitamin D supplements because the sun can’t penetrate your skin very well to make vitamin D. Your doctor can determine that with a blood test. The only supplements anyone ever needs are those which have been determined by testing to be low.