do you have a close friend that lives only a couple houses away?

just before the storm you could invite them round to sit with you and try and calm you down- hold your hand if need to

before the storm, climb in to bed and put the covers fully over you. that way you can think.. right, okay, this is my safe place, i can't hear it, i can't see it... and it can't get to me here.

try doing something you really enjoy beforre hand, read a long book, do a puzzle, or something- then when the thunder starts, you'll be still doing the activity and hopefully distracted enough not to notice.. but for it to work, it has to be something really affective

that's all i can really suggest- but, as long as you stay away from electrical sockets, don't go outside, it can't really hurt you. promise