His blood tests came back negative.

And in early. Good thing because he was freaking out. Rightfully so but really freaking out.
Excellent news, I hope he can recover soon.
In my case, the next study is in two months, in the meantime I am undergoing treatment to regularize three hormones outside the parameter and continue with the preventive measures, due to the fact that there are again cases of contagion of the COVID variants.
I'm worried the blood tests don't tell the whole story with him. He's worked in this area for 14 years. He's been exposed for a long time. The good news is he's 62. I figure it takes the cancer a long time to show itself with a little luck he will die of natural causes before the cancer becomes an issue.
So you have two months to worry about the next test and get yourself through treatment. I'm going to suggest something I found that really just occupies my mind, I can do almost any where and just calms my ass down. It's called zentangle, basically it's doodling. Just need a pen and a piece of paper. There's some geometrical designs that are very easy. You can get more complicated, buy a book, that they take you step by step through before you start to do it freely. I lean towards the plant type designs but there's all kinds of designs you can copy. I can totally lose myself doing that.