My knee has been killing me for about 3 months as well as my ankle and top of my foot (not sure if it’s related) if I’ve been sitting for a while when I try to straighten my leg out my knee is absolutely in agony and almost feels stiff so I have to straighten it out very slowly. Same when I get up in the morning it takes me a while because my knee is so sore and stiff but then when I’ve been up for a bit it’s fine? Like normal waking is okay. It’s after I’ve been sitting and then try to move. Occasionally I get a deep intense ache right down to the bone of my knee too. My ankle on same leg is sore and struggle to weightbear as well as the top of my foot feels tight. What could it be? I’ve convinced myself I have bone cancer and I’m panicking. I’ve been to the doctors a lot lately for other issues so I’m worried to go back with another ailment.