If it's serious, then I advice you go to see a psychiatrist, as it's better, you can tell him/her your thinking and your anxiety, he/she can help you.
But the main is : You have to be positive, trying to do somethings that relax, going out for a walk, or talking with your friends then it 'll relieve your anxiety.
Anxiety can be terrible. Some non-medication things you can do are controlled breathing, meditation, and different relaxation techniques. You should visit your doctor and let him/her know what's happening. There are different medications to help with anxiety. It's worth looking in to.
I am so sorry you are having anxiety.
One way to control it is to utilize breathing and refocusing techniques.
Several are discussed here:
http://solvinganxietystressandpanicattacks.blogspot.com/2017/09/solving-anxiety-panic-attacks.html
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