ranting about my knee

have you ever had a hunch, gut instinct, just a feeling that something wasn't right no matter what other people said? thats how i feel about my knee. it started bothering me when i started working out at the gym. the pain comes and goes so i usually just put up with it. but for some reason this past wednesday when i walked i was in alot of pain after. and this time the pain isnt going away, it feels alot worse. its on the inside of the knee and pain radiates down into the calf just a little. but it doesnt matter if i'm sitting, standing, or lying down-it hurts. and then i also feel a rush of warm sensation on the bottom of my right foot too at times. all i know is that i couldnt sleep hardly last night so i decided to go to the med clinic today. the doc that examined me said it was prob tendonitis and to do stretches. she wanted me to do a stretch there and when i did i explained that when i tried to bend my knee it felt like i was sqeezing something on the inside. she then looked at the back of my knee and said that it was swollen and i may have something called a Bakers Cyst but she doubted it. so instead she gave me a knee brace, told me to take ibuprofin, and if it still hurt in a week to come back. well, i know it will. i already took some ibuprofin and its not doing a dang thing. i want to know whats going on!!!! i may check with my GP next week and see if he can get me a MRI or something (he was out of the office today) because whats the use of trying to exercise when all it does is inflict more pain until i know WHY. know what i mean??