Respuesta :
Answer:
Anxiety or a phobia.
Explanation:
Anxiety is when you are constantly nervous, and a phobia is when you are immensely afraid of something. Isabelle might have one of these considering "sudden shortness of breath, faintness, and cold sweats" is something commonly seen in anxiety / a phobia.
As for the specific phobia? Maybe death, considering she "feels a sense of impending, unavoidable doom". This could be interpreted as death, as death is unavoidable.
I hope I could help!