Common heart attack signs and symptoms include:

Pressure, tightness, pain, or a squeezing or aching sensation in your chest or arms that may spread to your neck, jaw or back.
Nausea, indigestion, heartburn or abdominal pain.
Shortness of breath.
Cold sweat.
Fatigue.
Lightheadedness or sudden dizziness.
May 30, 2018

https://www.mayoclinic.org/diseases-conditions/heart-attack/symptoms-causes/syc-20373106

Sudden unexplained outset of Nausea for two(?) hours, the second occurrence out of the blue, in over a year, ought to get everybody's attention, except for the hold my beer crowd, the anti better to be safe then sorry believers.