"I'm fine." The Doctor replied, He wasn't wanting her to worry, but his legs were threatening to give up on him too. He really hated being this fragile and weak. There was no giving up easily for him as well. He coughed again and looked around. Stupid illness. He didn't like how it was weakening him so fast today. He had been ill for days and knew pushing it had been risky.

He was still trying to focus on other things, He hoped it wasn't some difficult illness that he wasn't going to be easily able to find medicine for in the TARDIS. He coughed again and covered his mouth so not to cough on her, He really did sound terrible. He was sure that he was going to struggle more and more. He knew this planet though beautiful was likely to be dangerous. The TARDIS had picked up something going on here as well, that was why he had come. He was panting a bit like the effort to walk was taking too much out of him. He just looked ill.

"Yes... will be dangerous though," he warned her. The Doctor wasn't focused on his own safety. He was the one who was ill, He wasn't sure how he could protect Donna, but he would always try. Though he soon fell to his knees and began throwing up, He was unable to stop that and there was trouble near by and it was getting closer. He coughed weakly.