I'm new to this group and I wld like to know if anyone has same or knows about my knee problem

Hi all, I’m new to this group and I wld like to know if anyone has same or knows about my knee problem. It has been 1 yr now I have had knee pain, crackling sound when i raise up and down followed by pain. At times I cnt walk well and others walk at all. I have been to 2 specialist in different countries and have been told exactly the same thing which is " I’m sorry but we dnt know the cause of ur condition and there is no cure, u just have to wait it out and it’ll pass." I then asked how long it might take and they said btw 2 mnths to a yr. My problem is that this has really affected my active life and the hobby I most love ( dancing and gym). I have 4 kids and put on more weight almost 20kg in a yr. Clothes dnt fit, getting depressed and this affects my while family and day to day life. At times I feel it getting better, I feel I can take a walk and it all seems fine till the next morning I get up and start all over with pain and all. Then my mood just shoots down. I only wish to know what this is and how long if at all will it take to fully get back to norm. All xrays I did seem to be all normal no fall no injury, I tent even fall it just happened 1 morning I woke up and saw my knee swollen after a night out with friends. Pls help!!