You have a problem and it needs to be fixed quickly. Your pH was at 6.8 and you added acid. That means that it is now well below 6.8 because that's as low as your test kit can measure. It may have been below 6.8 before. You should start aerating your pool by whatever means you can, even if you can only point the eyeballs toward the surface. Get some borax in the water as soon as you can. You're probably going to run the store out. My ~20,000 gallon pool takes about a box of borax to move the pH up 0.1.
Acid does not lower alkalinity.
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