Welcome Teabouv!
What I learned by being on this board is allllll the worrying and fixing and stewing and hoping and wishing and trying to help and trying to control and thinking about and fussing about...others.
You might want to pick up a copy of Codependent No More by Melody Beattie, which has been a lifesaver for many of us.
I now work on catching myself in the cycle of fussing and go back to some deep breaths. I ask myself, "where am I right now and what needs to be done right now?"
That keeps me more still and less stressed.
I also work on remembering that the Universe (insert God, your Higher Power, your Deeper Knowing, the Goddess - whatever) will take care of others (and me) if I just relax and trust.
Wishing you
peace