How do I know if I am overdoing it on sodium in my water?

I am using electrolyte powders like LMNT and NormaLyte, in my water, all day, every day. If I drink straight water, I start having worsening symptoms. I have Dysautonomia/POTS with IBS-D, and have no control over my body temp. Sometimes I just pour sweat in a cold room. So maybe I need all that salt? I just worry that it’s hurting my kidneys.