HELP! really bad knee pain

right guys i need help.
the other week i started getting really bad pains in my left knee, i have had pain in my right one but that was because i was growing, i can tell this isnt the same as it is a different pain. i cant put weight on it, i cant walk up on down the stairs without it hurting. i am a swimmer and my knee really hurts when i swim and i just want it to stop, the other night i was swimming and it started hurting under my kee and at the sides, but i thought because id had it before i can push through it but i could and it made me have sooting pains down my shin. this really hurt, i just want some help because the doctors arent any help.
please?
thankyou.

dear emilyjanep

painful knees can be really annoying...i say this cause i know how much of a nuisance it can be to daily activities of life. howvwer , giving you some suggestions will be hazy considering the lack of detail in your history. you might want to expand more on your symptoms, i.e how it behaves in the morning, or at night...any added stiffness? did it come suddenly or gradually, what makes it better? what positions eases the pain,? is it a constant pain...?does ordinary bending and straightening the knee make it worse or is it only in weight bearing tasks? does it feel warm, any swelling? the list is endless...do you play any sports...

Nonetheless, in my own opinion knee pain made worse with using the stairs most often points to a patella maltracking problem...because of your age, it is unlikely that any degenerative changes are occurinng however this is not a true factor for total exclusion...your age however points to problems with growing bones...it is possible to develope problems with patella tracking from disruptions in how the proximal tibia forms...because this is were the patella ligament that goes over your knee cap attaches

having shin pain also adds to that possibility...if you are having problems putting weight on your knees then i would suspect issues with the bones. these are only speculations from what you have described...

your best bet is to have an x ray done first to rule out issues with growing bones, then have the patella tracking assessed...

best of luck