Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. The mentioned condition is quite natural. Fear arouses adrenaline and adrenaline makes our body aroused so that the next eventuality is taken care of. Startling and jumping is part of that arousal. Sweat, palpitation, trembling etc are also part of that. Children are unaware of these symptoms and therefore, they feel that are actually in bad shape. Naturally they feel tired and dizzy. Nothing to worry. To make her convinced, you may visit your doctor. If you require more of my help in this aspect, Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe the needed psychotherapy techniques which should help you cure your condition further. Hope this answers your query. Available for further clarifications. Good luck.