Matte Knee

knee popping! HELP!?

So, i took gymnastics for about 8 years and then quit because it was becoming too much for my body and we didn't have insurance (blah blah blah) But about a year after i quit my wrists started cracking and then came my knees and ankles. Normally it would happen when i would get off of the floor or going up or down steps. I recently visited a gym and after warming up well, i went on the trampoline. I got used to it fast and i was doing front flips onto a mat. About the fifth time doing these flips I came out of one wrong. My knee was locked strait and i could see it as i was coming out of he flip, but i could not move it so when i landed, it made a loud popping noise and i felt terrible pain. The pain only lasted about 10 minutes and then i was running again. I woke up the next morning and now i have this terrible aching pain/soreness that will not go away. help?

ive done that before.... mine was sore for about two weeks... i use to dance so my body is use to a certain amount of wear and aches.. but this pop sound was different... i used a menthol heating patch on it