OJ is not your only source of Vit C. Potatoes are a really good source too (chuck a boiled spud on your brekkie! ) But also try capsicum, raspberries, blueberries, broccoli and watermelon; they're pretty gentle on the old reflux, too, and will help you boost your levels.

I second dusty on the psyllium husk to relieve constipation - I have a lot of it, and find it's also really good for heartburn.