It's been 30 years.
My sarcoidosis was diagnosed by taking one of my lymph nodes out. The eye doctor was the first one to suspect. My eyes turned totally red and I was sensitive to light. I remember staying inside with the shades drawn and sunglasses on. When I went outside it was night and I had to wear sunglasses and avoid looking anywhere near streetlights.
For me, it's been 23 years since the big trouble hit, and 15 since the sarcoid diagnosis. I never saw anything that said vitamin C would help, though I did try it along the way for symptomatic relief, though not at the doses you mention. It didn't seem to help much.
I have found that the antibiotic protocol I'm on is getting rid of the sarcoid. A lot of the other getting-old-fast stuff is going away too, like cholesterol and triglycerides and insulin trouble and high PSA tests.
The next question would be if you have any other auto-immune trouble like arthritis, or diabetes, asthma or psoriasis. The current research suggests that these are all tied to the same set of infections.