Is my knee/leg broken?

I still had one step left to go up from the stairs, but then I fell on my knee.
I already went to the doctor and because of the pain I couldn't really walk on my leg. I told the doctor that but the doctor thinks it isn't broken.

The doctor said I need to look out for this: "If it becomes red, feels warm, you develop a fever, or the pain worsens, please get in touch again."

But I try to walk normal on my leg at home. If I put weight on my knee to move, such as walking, I am in excruciating pain. The pain doesn't go away when I put weigh on my knee to just walk.

But when I asked more questions the doctor seemed not to like that and got away very quickly. I don't like my doctor so that's why I ask it here.
Is my knee/leg broken?
Post Opinion