Its vital you have that support in place.
Its not your responsibility, you have reported it now, whether or not anything comes of it is out of your hands, you have done all you can, which was very hard to do.
Going ahead with such a case can cause severe ptsd, and I wouldn't blithely advise anyone do this because of the potential permanent harm it can do.
I glad the police have been sensitive enough to acknowledge to you that this isn't a matter of not believing you, but that simply they don't view this as sufficient evidence (I completely disagree with them because your evidence is your statement, the same as any trial, its very poor, but you can see what causes so few to be brought to justice).
You have had a huge almost revelation to have all this come back into your daily conscious and to have openly spoken about it, on here as well as to the police. Take things slowly, eek oit your last sessions so you have a bigger gap between them and go to your gp for an urgent referral.
I am so sorry you have had these awful experiences, it seems that your brain is now choosing for you to deal with them, the worst bit is the first bit.
All the intensity is now, try to keep things slow and gradual, make sure you up the amount of exercise you do, and the looking after yourself nutritionally and with comforts, quiet times, and some really good relaxation, to balance the times of anxiety so your mind and body can really rest.
Have you spoken to rape crisis as they will offer specialist counselling?