I was at a trampoline park about 3 weeks ago. I jumped off a platform - about 5ft high - onto another trampoline, but felt something in my upper back as I landed. I then couldn t jump without it hurting. For the next week, I was pretty stiff all over. Three weeks on, the muscle stiffness has subsided, however whenever I twist, or turn over in bed, or turn around to reach for something, I get severe pain in my upper back. I m female, 26, and pretty active. Should I go and get it checked out?