You wrote that you “found out” via the internet that you have anxiety disorder. Self-diagnosis via the internet is problematic and ill-advised. The proper way to know if you have an anxiety disorder is to be evaluated in-person, by a mental health professional.
You wrote that you are in your “last days” but did not describe how you know this. Did you have a dream or a premonition? Were you diagnosed with a terminal illness? If there is no evidence to support the notion that you are dying, then your belief is speculative, perhaps driven by anxiety about death.
Death anxiety is not uncommon. Intellectually, we all know that we are going to die. Psychologically, this realization can be emotionally distressing and thus many avoid it or even deny it. You might benefit from reading the many books written on the subject.
I would advise you to consult a mental health professional, in-person. They can provide treatment if a disorder is present. A few sessions with a licensed therapist might be all you need to resolve this issue. Thank you for your question. Good luck and please take care.
Dr. Kristina Randle