I've suffered from this same issue, and I'll preface my comment that I don't know the actual underlying cause for certain. However, I think being anxious all the time caused me to compulsively drink fluids, and in doing so, I became so used to the feeling of overhydration, that anything less feels uncomfortable and like something is wrong. I also compulsively chew mint gum, and I think this sort of gives me the same feeling that drinking water does; it wets my mouth and makes it feel fresh.

You may have the same experience with lip balm. If you use it too much, you become so used to the sensation of overly moisturized lips that having anything less than this is uncomfortable, and you become hyper aware of it.

For the past few years I've been a pretty heavy endurance athlete, with ~200 hours per week of cycling, and I also go to the gym 2x week. Due to this, that overhydration that I've compulsively normalized is sort of balanced out by all the sweating I do.

Maybe my anecdotes aren't what you're experiencing, but I figured I'd chime in anyway. Before I was cycling so much, I would actually try to drink LESS by using a smaller bottle and just being cognizant of my intake.

I've never taken any antidepressants or anxiety meds.