Less likely to be kidney stones, they usually have the opposite result, toxic fluid retained in the body and not filtered out correctly, but there could be some other activity inside the Kidney that needs to be checked out too. I've not come across need to fully empty the bladder more often with endo.
I certainly have had emptying issues with endo, or post endo op, but my frequent loo trips were because I wasn't fully emptying 1st time round because endo was flaring. Pink pee is indicative of endo in the bladder, because of internal bleeding, but the same thing can happen with IC also.
If the pink pee is from a kidney stone and/or infection you really would know about that from a pain point of view. Kidney stones give you super extreme pain 10/10 level. You'd not be able to type your post on a computer that's for sure. I've been hospitalised 4 times with kidneystones , so on that score believe me endo pain is not nearly the same level of intensity, but a bursting ovarian cyst comes pretty close at 9./10 but the pain of that doesn't last as long thank god..
so unless you are showing signs of a kidney infection (shivers and fever.)
Excessive thirst, for dehydration is more often associated with the diabetes and infections, can also be a side effect of many drugs. You'll need a raft of tests to rule out the possible causes and hopefully determine what's behind it, but it is not a common issue for endo ladies, unless it has been brough on by their meds. You must see your GP quickly regarding frequency of peeing, it can be a sign of serious conditions, so even if it just to rule that out if nothing else,
Please visit your GP asap and take a pee pot sample with you, as it can be checked there and then by your GP and sent off for further analyisis if needs be. The sooner you see the GP and get on the merry go round of trying to identify what the root cause is the quicker you can address the problem and get some quality of life back.
Best of luck. Hope your get fixed up really soon.