Yep,getting a basic metabolic panel done would really be the way to go here.there are things like potassium and magnesium and calcium that are very vital minerals and electrolytes that the body needs to just maintain normal "homeostasis"(stability),they all kind of 'play' off each other to just maintain normal system functions,including your heart rate and rhythems.i don't know what prompted you to just suddenly down a ton of water but if you were feeling that thirsty,you were probably already feeling a bit dehydrated.so it probably wasn't as bad as you may have thought it was,really.our bodys just are naturally made up of alot more water than the average person really realizes.are you still now,today,feeling that same way you were when you drank all that water?if so,i would get the blood work done.if not,things have probably obtained the normal levels by now if you were eating right.taking a simple multi vitamin will also help to replenish the minerals you lost too.if for any reason you just don't feel right,just see your doc for some simple bloodwork.this would really tell you in the most accurate way,where all levels currently are and whether there really is some sort of actual depletion going on.that is what your doc is there for.to take care of you when you don't feel right for some odd reason.good luck and i hope you are feeling better by now.FB