Sherlock was looking at him "Because of the way I treat you." He replied. He knew sometimes people were nice regaurdless of how others treated them. He knew that Lestrade could only just be helping him because John was away. He was shaking as he always found hospitals too cold.
"Ugh its too cold," Sherlock growled. Another reason that he really hated hospitals. He was glad to be going home. He was looking at Lestrade when he got the wheelchair.
"Don't tell anybody." He didn't want anybody knowing that he needed to be in a wheelchair. He was sure that people would gossip and spread the news that Sherlock was in a wheel chair. He lets Lestrade help him into the wheel chair.

He looked rather tired. He couldn't wait to just get out of the hospital. He knew that it would be hard to not work like he normally did. He refused to miss out on cases. He was looking to Lestrade. He had been grateful when Lestrade had looked after him and got him home when he was sick. Even if he never admited that and had been very diffcult during that time.
Sherlock did wonder why stuff had to happen to him when John was away.