PS: if you don't have a professional do something about it quickly your house will explode.
That's why I stopped asking / reading answers about this kind of stuff on forums, and have a professional come and see to give me a real advice. Every case is different and reading random advices on the internet can bring a lot of anxiety. Especially if you decide to do nothing while some people told you that it could be really bad.
Not everybody, usually RTTs depend on how much overtime is planned in your contract (eg. most engineers work 37.5h instead of 35h, so they get 1 RTT each 3 weeks). Many people don't have any RTT
La main droite, c'est celle qui a le pouce à gauche