Anxiety is an emotion, it's part of you - it's not something external to you.
Imagine anxiety as a small child that's been scared by something in the past, which it remembers all too well. It's holding your hand and starts by whispering "I'm scared, mum". If you ignore it, or tell it not to be stupid, or to fuck off, it will start to raise it's voice until it's screaming at you and it will do whatever is necessary to drag you away from the perceived danger - hence the typical 'flight or fight' physical response of stomach upsets, rapid breath, lightheadedness, etc.
So, how to deal with it? Be the parent. When you feel anxious, remind yourself that you are an adult, you can cope with whatever life throws at you and that you have the experience, the knowledge and the resources to deal with the situation.
This analogy might help.
When a mother struggles to get her child to go to sleep because the child says there’s a monster under the bed, does the mother quickly grab the child and rush out of the house calling the police to deal with the monster? Of course not! That’s because the mother knows there isn’t a monster and that those fears are the fears of a child. Whilst we can easily understand why the child has those fears, we recognise they aren’t necessary.
Listen to what your anxiety is telling you, but use your logic to decide if it's true or whether you can safely reassure yourself that it's not going to happen, or that you will cope - as you have done before. Always be kind to your mind.