I am very sorry to hear that. When I was applying to programs, I looked at the average GPAs of accepted students (PTCAS provides this). If my GPAs fell above the average then I knew I'd be good at least in that department. However, if my GPA fell slightly below I looked at average GRE scores to see how my scores compared. I personally had a good amount of observation hours in several different settings and knew my extracurriculars, as well as my essay, would make me a strong applicant. Have you looked into applying to programs where your GPA is near that of previous accepted students? Also how do you know you are being rejected solely because of your GPA? Could your application be lacking in other areas?
I agree with the user above though, If PT is really something you want to do, keep working at it! All of your hard work WILL pay off