Three months of chemotherapy this past summer weren't enough to knock out Ethan Zohn's case of Hodgkin's lymphoma. So he's back in the hospital, connected to tubes and wires, undergoing even more chemotherapy – and in his latest video diary, he takes viewers inside his tiny room to share the experience and let his fans know how he's doing.
"I have been locked in this room for three days, and I've gone a little bit stir crazy, I'm not gonna lie," says the Survivor: Africa winner, reclining in a hospital bed in part one of a new three-stage battle he's waging against the resurgent cancer.
In late August, Zohn discovered that the cancer he had been treating since May had actually spread. Last month, he began an intense treatment regimen, starting with two new chemo sessions. Those will be followed by radiation therapy, and – in December – a complete stem-cell replacement therapy that will keep him in the hospital for 30 days straight.
Finding a way to break his stir-craziness after three days, the always-driven athlete says in the video that he was excited to finally get up and walk around – just before taping his message to viewers.
"They finally let me out in the hallway where I could do some walking," he says. "Fourteen laps [around the hall] is a mile, and of course I tried to break the record – so I did 28 laps. Which I'm pretty happy about."
Showing his usual upbeat nature, Zohn adds that he's feeling positive about the new chemotherapy: "So far so good. I feel it killing all the cancer in my body, and I'm excited to keep doing what I'm doing – and I'll see you soon," he says.
For more on Ethan's cancer fight, keep coming back to PEOPLE.com