This is what happens when you try adding supplements to ionically imbalanced water- everything gets out of whack, fast. Sounds like all sorts of things going wrong, but I would put your alk at DKH of 19 at the top of the list.... that needs to go down.
I would advise you to
stop adding supplements of any kind, and do several large (say 40%) water changes over the next week or two. Keep measuring your levels throughout, and read the articles posted above in your spare time.
Then, when your CA/ALK reach good, balanced numbers (see articles) you can begin SLOWLY supplementing with a balanced system such as b-ionic or kalkwasser.