I think it's quite normal for that age. When my daughter was around 7, she developed lots of weird, irrational fears that bothered her and she is NOT an anxious person.
She got bit by a spider on her neck, so she decided to sleep with her covers wrapped around her neck. It made her sweat and uncomfortable, but she wouldn't stop!
She became obsessed with having doors shut all the way at night because monsters might get out. If doors weren't shut all the way, she would actually start crying!
She wouldn't walk into any dark room. Even our own hallway in our house! We had to go turn the light on.'
She'd often complain of nightmares, but then sometimes she'd complain of nightmares about 15 minutes after putting her to bed, so we knew she was faking.
A lot of the fears and drama seemed to go away around age 9. Some of the things we just indulged her in, like making sure all doors were shut tight. Others we talked through. There was no one big solution that worked, it just seemed like eventually she outgrew it.
I wouldn't seek a counselor just yet. Lots of young children are scared of thunder and lighting. Even at 12, my daughter is still scared during thunderstorms, and so are her friends. They talk about it! So I wouldn't worry about it too much.