Hi,
I injured my knee in July when I turned on it. I should have seen an orthopedic surgeon straight away!
On the NHS I had to wait till 29 Oct, to finally have surgery for a 'band of tissue' (called a plica) to be shaved (as it was swollen).
GPs tell you to just "put ICE on it", whereas you should be seeing a specialist straight away + MRI scans to confirm what it might be asap!!
Good Luck.