Popping noise in my hip when I lift my knees up? or it does when I'm laying...

[Blaze]

...on the floor and move my legs? I'm 16. About 2 months ago, I injured my hip due to doing a Back flip without warming up. Ever since then, I have been injuring my self over and over again. After a month, as I got out of the bed, I heard a popping noise in my right groin area. I realized that I pulled my groin. Ever since then, I feel like somethings popping in my lower back when I lift my knees up or when I'm laying on the floor, moving my legs from a "tucked" position to normal position. But I can only get into half way into the tucked position cuz if i push my self, my lower back hurts. I went to my orthopedist 3 weeks ago, he told me to rest ( I showed X-Rays and stuff and my spine is perfect and I didn't herniate a disk or anything). On the end of second week, I tripped and fell down. I heard a big crack on my back and in the groin area, how ever, my groin area doesn't hurt at all. I went to my family doctor a week ago, she prescribed me some Ibuprofen and I have been taking it for 4 days and feeling a lot better each and every day. However, I can still hear the crack when I lift knees up. ALSO, I forgot to tell my doctor about this. So, how do I treat this? is it only rest with medications? or what? Thanks.