Anxiety and driving

Iv suddenly found myself super anxious when i drive, and I have no idea why. I clench my jaw, my insides feel like they are about to explode. Nothing's happend for me to suffer anxiety about driving. Not so much on local roads, but the highway, or winding roads. I can't pin point the reason. Iv not been in any accidents, or any one else close to me. I'm not scared ill have one ether, I just feel anxious about the whole situation. Iv held my licence for over a decade. One accident when I was on my reds, what wasn't my fault and at 40km. There was next to no damage to ether car.... why would I feel like this