What is the reason the questioner remembers death and the accompanying chest tightness, nausea, and numbness in the body?

Remembering death and preparing for it helps one to be proactive and persistent in acts of obedience. He who frequently remembers death is honored with three things: hastened repentance, contentment of heart, and zeal in worship. And he who forgets it is punished with three things: delaying repentance, abandoning contentment with sufficiency, and laziness in worship. It is advised for those who suffer from physical symptoms to consult doctors and seek medical and psychological advice.