HELP. Seriously doubting my sanity.?

Nothing is wrong with you, we all have fears/phobias. Yours is quite common actually. You said that you haven't always been this way, so maybe it will p. But, if it doesn't then don't feel bad about it, just find a way to cope with it. Wear head phones and listen to music when its getting ready to storm and getting yourself occupied with something that really takes your mind off of it like exercising or something like that.