The Art of Letting go

I guess it is a form of art and I totally lack the talent.
I don't know how to let go and how to stop going over and over the same situation until I make everybody sick of it.
Today, I had a student helping me at the office and her chair broke, which caused her to fall and hurt herself really bad. She already has back problems and she has been attending physical therapy. I was really worried so I sent her to the Student Health services, and then I wrote a Memo to my boss about the incident.
I tell you, I was feeling so much like crap, mostly because we don't have the money to buy good furniture so all the stuff we have is recycled furniture from other offices, things that other people doesn't want we reuse it at our office.
When I saw the face of that girl today trying to stop the tears from coming out I felt like a piece of crap. There she is trying to help us and the damn chair breaks on her. And I can't do anything about it. I almost started crying too.
It's so unfair! My office is trying to help a group that is almost 20% of our population and we are set to a building that used to be lockers for the local Football team 50 years ago, and with almost no windows. We can not make any major changes because the building is pre-asbestos era, and if that is not enough they sent us to the basement of said building. All the money we receive (which is very little in comparison to the amount we really need for the things we want to accomplish) has to be used to do the activities and programs that our community needs. My boss barely sleeps working for this Center and doing classes (she is also professor) and I can tell she is really worried about the future of our Research Center given the cuts that projects like ours are experiencing from State and Federal funding.
Last weekend I didn't even sleep working to prepare a meeting to be able to get support and I think it was successful, but we won't be able to tell until we receive some money as an outcome from that.
New furniture is not in our budget and is not really affordable.
I wish that somebody could donate some nice furniture. I'm so sick of all the almost useless stuff. I'm very lucky we were able to secure money to buy me a good computer that actually shows the images on the screen. But I'm afraid that is where the magic ends.