Welcome to health care magic
I can understand your situation. I appreciate your effort to seek online support.
As per your details, you are possibly having panic disorder characterised by "Panic attacks" which are "intense anxiety attacks followed by impending doom".
For this consult a psychiatrist
for detailed evaluation. Following treatment strategies would be helpful-
1) Antidepressants/antianxiety agents
like SSRIs (escitalopram, sertarline, paroxetine etc)
2) Antianxiety agents like clonazepam, lorazepam, alprazolam etc
3) Psychotherapy/ Counselling
4) Relaxation techniques
like yoga, meditation, deep breathing etc
Hope it helps
Dr. Gourav Monga