Although blackhash could probably assist you better with this......i will give it a shot.

It sounds to me as if you are having PH and/or over-fert issues.
If you are growing hydroponically,you're PPM(parts per million) may be off.
Are you testing the PH and PPM?

I used to over-water in soil growing also.........it takes patience and planning.
You have to let your soil dry out between waterings.If it is a big problem,just get one of those plant moisture meters and you should be able to soil grow.
I have a soil PH tester and water PH test kit that I use. I have issues with alkaline(high PH) water also,so I have to adjust it down accordingly.
You may have to water with 5.5-6.0 PH water for a while until the plant heals if you've been watering with high PH water.