There is no legitimate evidence that high dose ingestion of ascorbic acid ever exacerbates any illness or negative health situation. It only [ultimately] helps. To quote Dr. Klenner again, "I have never seen a patient that Vitamin C would not benefit.” And he treated tens-of-thousands of patients, as a general practitioner, in his long career as a physician.
That notwithstanding, Margo, caution is often required, particularly at first, because ascorbic acid is such a powerful internal cleanser, i.e. it might detoxify a person more quickly than they would prefer to endure. My advice is to just take it slow and gradual, and monitor your symptoms, i.e. approach your healing at a pace you can live with.
I hope that helps, Margo, as "grist for your mill."