Runners knee

Has anyone ever got runners knee during running. I believe this is what I have. I am having pain in my inner knees just below the knee cap. Very painful when walking or running. Basically any pressure. Feels good when I’m sitting her laying and there is zero pressure put. I’ve lost 20 pounds in three months. I’ve been out from the gym for one week and I’m scared that I’m gain all my way back because I don’t know how long I will be out. I am in so much pain. I’ve read that it can take up to six weeks to recover. I don’t think I should be concerned enough to go to the doctor, though all I will be told as to which I have been and to take pain meds, which I have been to.