Health shop remedies.... Can you help?

Hi,

I have 3 boys, 2 are being assessed, with one that most likely has autism and adhd, and the other with the possibility of learning needs, anxiety and ASD. My one child suffers extreme anxieties, to the point he can lose bodily function. He keeps everything locked up so its so difficult to help him with his fears. So whilst we keep trying to gently open up about his fears we have looked at alternative ways to help. On the internet, I found something called Bachs rescue remedy for kids, theres three types of this alternative remedy and one of them is for stress. Im just wondering if theres anyone out there that has used this for their child, and how they found it. Any help would be gratefully received. Best Wishes, Lisa :)