Yes, it is possible that you are suffering from PTSD. Everything you report supports the possibility of that diagnosis. Your daily anxiety tells me that you need to confer with a professional. There is no shame in responding as you have to such a traumatic event. You are having a normal reaction to an abnormal situation.
You’ve already tried unsuccessfully to handle it on your own. In spite of trying their best, your friends haven’t been able to help you either. Your symptoms are serious enough to take more seriously. That means making an appointment to see a therapist who specializes in trauma work.
Please don’t hesitate to talk to your parents about what happened and how you have been feeling since. Show them this response if it would be helpful. A few sessions now can help prevent your current level of anxiety from growing into something more intractable.
I wish you well.