Until you get a CYA level, stop using dichlor AND trichlor. For now, just use bleach as your source of chlorine. If your kit doesn't test CYA, go to a reputable pool store and ask them to test it. Then post it here. But, don't buy all the stuff they are going to push at you.
In your pool, each gallon (4 quarts) of 6% bleach will add about 2.7ppm of chlorine. Test two or three (or even more if you able) times per day and each time, take the chlorine back up to about 10 for now. (When we know what your CYA reading is, we may advise a different level but go with that for now.) Continue to sustain the high cl level until you can go from sundown one day until sunup the next day without losing more than 1ppm of cl overnight.)
Your pH needs to be brought up ASAP. A reading below 7.0 is acidic and can damage your pool. Actually, a test kit cannot differentiate below 6.8 so yours may lower than 6.8. 20 Mule Team Borax (laundry aisle at Walmart) can be used to raise pH. Start by adding a box slowly to the skimmer while the pump is running, breaking up any clumps. After 2 or 3 hours, retest pH, and add more if needed. Anywhere 7.2-7.8 is Ok, but I like 7.4-7.6.
You may want to bump your alk up a little to help control those pH swings. Add 2 lbs. at a time slowly to the skimmer. Wait a few hours, retest and redose until you get alk around 100 or so.
Do yourself a favor and get a good test kit so you won't have to rely on a pool store for readings. We recommend the Taylor K-2006 or 2006C which is the same kit with larger quantities of some of the most used reagents. If you order it through the Amazon link in my signature below, the Pool Forum makes a little money on the sale which helps keep the forum online. Only buy if the seller is Amato Industries, however. Some other sellers are substituting the K-2005 which you do NOT want.
Repost with your CYA reading.
(By the way -- ignore the bromine reading. You have a chlorine pool.)
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