probably neither are they
ok, well lets just focus on the permanent part of that. Its not going to be a permanent thing. Its like when your car is acting up, you take it in to the garage and ask them what's wrong with it but its not doing "that thing". A good mechanic will tell you to come back with the car when its "doing that thing" because then he can try to figure it out (and he's therefore not wasting your money).
So unless you are sick and you do have another recurrence (you may not) they have nothing to go on, no data to work with and so all they can do is "
go by the book and try what it says" which is to say "
do something general and hope it goes away by itself". Which it did in this case.
Its probably not endo because that stuff is easy to culture. Also endo is typically caused by oral health issues (not clean mouths).
Remember, its always your body which heals itself, even if it does require a bit of an
external push along by a surgeon to swap out a part, or diagnosis of an antibiotic to hold back the infection; it is the body which grows back around the wound and the body which kills the bacteria.
I know its difficult and I know its hard to control your emotions (don't ask me how I know) but the best thing for it is to just "do other things" as you can and put it out of your mind.
Eat healthy, do as much exersize as possible / prudent, and most of all keep a good attitude. The last is important because being despondent does actually impair your immune systems ability.
If there is one thing I don't like about the modern re-interpretation of Dune its that the Bene Gesserit pray of dealing with fear is downplayed.
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Read and re read that until you can say it from memory ... its a good mediation.
Recovery is sometimes bumpy ... don't ask me how I know (and I've had 3 OHS).
Best Wishes