Congrats on the test kit also & Ditto to Butterfly's post.
I have the same sized pool as you, so I plugged some #'s into the Pool Calculator, & come up with adding 65 oz of washing soda/soda ash, or 142 oz of Borax (whichever is easier to find) to move your PH from 6.8 to 7.2. Or if you had a way to aerate your water, that would raise the PH also without raising your TA higher. I've never had to raise my PH, so someone else can correct me if I'm in error.
After you get the ph back within range, then get the chlorine back to shock level at 13 or slightly higher & keep it there till you see some progress. I'm assuming you meant Free Clorine by the 13. It would be good to do the second part of the test to see if you had any CC's. (combined chlorines) It would also be good to do the calcium hardness test also. Per our Pm's, keep checking for any extra junk in the pool you can net out. Then as Butterfly said, with some POP (pool owner patience) and your favorite beverage, it will clear up.
Keep us posted...