The term we use here is that you been "poolstored" -- this pattern is not uncommon, and there are folks here who spent twice what you did, before coming here.

The bad news is, it's very likely everything you've spent so far is wasted, and some of it may even make recovery harder.

The good news is, we can almost always help folks like you recover, and typically for less than they've spent getting into their current mess.

Do this:

#1 - Go buy a cheap OTO / phenol red testkit and 24 gallons of plain 6% household bleach. Walmart will often have both.
#2 - Test the pool and report the results.
#3 - Turn your timer off, and leave your pump on 24/7 till the pool is cleaned up.
#4 - Add 4 gallons of bleach THIS evening.
#5 - Test your chlorine in the AM, and if it's below dark yellow, add 2 gallons.
#6 - Continue with this routine till the algae is gone, or you change routine based on the steps below.

OK. That should keep your pool from getting worse -- it may even clean it up -- while you do the following:

#1 - Buy some pool acid and add small doses till your pH is in the 7.2 - 7.6 range.
#2 - Do NOT worry about ANY of your other 'levels', except pH & chlorine, till the pool is all cleared up.
#3 - Monitor your filter, and clean as needed. Report here if the pressure does NOT go up after a couple of days. Replace the pressure gauge if it's broken.
#4 - Take a water sample to your pool store and have them test your water and tell you what your stabilizer (CYA) level is. Once you know, tell us.
#5 - If your budget's not busted, purchase a K2006 testkit (Amazon link below) so you can tell (and can tell us) what's really in your pool water.
#6 - Also tell us EXACTLY what all you've put in, especially the exact "yellow stuff" you used. ALL of the "yellow stuff" additives have major and long lasting side effects on your pool, but there are two main types of these products, and it really matters which one you used.
#7 - Do NOT let the pool store sell you ANY other goop -- not shock, not enzymes, not clarifiers, not boosters, not optimizers, not minerals, not phosphorus products . . . and especially, not algicides.

Let us know how it goes.

If you want to understand more of the how and why, follow the links to the "Best Guess" and BBB pages on PoolSolutions.