I Am 44 Year Old Healthy Female. 30 Pounds Overweight.

I am 44 year old healthy female. 30 pounds overweight. . Today i have been experiencing heart tighness on and off in about 5 minute intervals it last about 8 seconds each. Its been going on for a few hours. No pain. No shortness of breath. No unusual physical activities in past few days. What further symptoms would require an ER visit ? Thanks