Since you've been suffering from sub-clinical scurvy since conception, your body is not performing all the enzyme reactions it would if it could. As a result, your bowel tolerance limit will increase over time. I recommend you take 1000 mg tablets once or twice a day to start and increase your dosage every few days, backing off a little if you have the above mentioned symptom. Also, the stuff the manufacturers add to the C to make it a pill may disagree with you. Try different types if this is the case.
Some people are very sensitive to the acidity.
Calcium ascorbate tablets are available for you if the ascorbic acid is troubling. I do not recommend that anyone take lots of the chewable tablets. These are full of sugar and the acidity of the C is hard on the tooth enamel if the exposure level is high. I use the chewables for canker sores, but otherwise I rarely use them. Pauling points out that the chemical make-up is identical.