Why am I so mad when, I know I have to give my car back?

I’m very disappointed that I have to give my first car back, that I was paying on for almost a year now.

Basically I decided this September sometime to do the surgery for my knee. After getting the second opinion and talking to both the surgeon and his assistant.Which is who I saw at the office first couple times.

And get this one of the police officers who works with us and had the same surgeon, he had shoulder surgery but said he was great.

So I thought what am I waiting for lets just get it done…..

With that being said I asked of course how long does it take to recover or least go back to work. 4–6 weeks he said since I basically stand all day.

No matter how I add it up there is no way I can take a full 4–6 weeks off work and afford my bills without going in debt/late fees.

I’m just so angry this is happening I know it is not the end of the world , but it makes me so mad. I always keep track of my money and bills and this shit happens.

Also just so you know I have close to no family for support(parents or the like) and I’m not going to put strain on my Grandma or Aunt, out of the question.

What is the best way to deal with this kind of frustration?
or if you have any last minute ideas..?
Also sorry for the long ass story and venting but I needed it. haha.