LMNT & electrolytes

Hello everyone I was advised by my cardiologist obviously to increase my electrolyte/salt intake. After doing a lot of research the supplement LMNT seems to be really popular. I purchased some from my local vitamin shoppe just to test out some flavors with a sample pack flavor honestly actually tasted really good but weirdly enough had some kind of strange reaction to them I've been getting really bad headaches and honestly just feel very zoned out when consuming them not for sure if it's honestly too much electrolytes or if there's something else in them that I have a reaction to. Just out of curiosity has anyone else had any reactions to these? I've been only taking half out of time as I do know they are very potent.