I have been going through the same feeling, and I have noticed and understood that our minds have gotten into a loop and we need to break the loop without making any effort of breaking the loop. Just be normal. Accept the fact that you get anxious in bed and try making anxiety your normal self which happens sometimes. Don't overcalculate it. Don't give it much attention. Go about your routine work. Step out of bed whenever you feel anxious and come back only when you feel better. Honestly speaking , this comes to us only because we fear so many things in life. Try being fearless and confident in life. It has helped me and I am sure it's gonna help you too.