Accident… please ask for advice

The day before yesterday I had an accident. I went shopping with my child (22 months). Then I stopped at the red light, then gave my child a kekse, looked at the clock, several times at the traffic light. Then I see that the traffic light is green, and I drove off. And then left….. such a brawl… the car was hurled. In my Toyota Avensis old Ford Fiesta drove in. There is an older couple, the woman was at the wheel. I was very shocked (head, neck) )), then shock, child screams. I stayed sitting for a few minutes, turned to my child, then got out of the car, took the child out. Everywhere were already many people, helpers, service cars, police. Someone took me out of the road with child. Overall three cars were involved. Ford, I think, totally damaged. My Toyota also looks like that, becomes clear on Monday. BMW is, as I have seen, not so bad. The police officer asked me and wrote down, I told so But then it became clear to me that these two cars also had green… .. that means that it was still red with me, supposedly, but still red. I had no eyewitnesses who can confirm my statement. And I am convinced myself that I saw green, I am not a kamikaze… I did not have alcohol, take no medication, was not in a hurry and was not tired… .. I can’t explain it at all! I, my child, the woman and her husband I was taken to the hospital for X-rays and examination. Everything is OK with us, but I have something in the neck area, I have to go on examination, but I’m okay with my health. My little one was just in shock, the child seat saved him. The man had nothing, the woman was examined, had no idea if anything was detected with her except bruises. She then ran out of the hospital herself, on her own feet. Then in the hospital, the police sent me to the hospital. eamtin the accident report or report pressed into my hand and said that I was to blame. But it is being led to criminal proceedings to clarify the whole thing. She said that I, maybe, would forget… The insurance I informed, I have comprehensively, I also got the replacement car from Toyota… Now I sit and wait for what’s coming to me. I don’t know what to do now, or just sit and wait…. Maybe, someone knows what I’m doing and what I’m not doing. Which also bothers me very much, that I stood at the “red” and then drove when I saw “green”. And if it was “red” after all…. I’m afraid to drive now because I can’t trust my eyes anymore…. Thank you