Glad the EKG was normal and even more glad you are seeing your rheumy about this.
I had a similar situation, was having chest pains A LOT, had an EKG, it was a abnormal and a nuclear stress test which was normal. PCP blamed it on coming off Plaquenil or NSAIDS ( I can't remember which one caused this flare, I've had 3 of them due to med changes). Have you had any med changes?? Please let us know what your rheumy says. Take care and if it happens again do not hesitate to go back to that ER!
Trust in the Lord with all thine heart, and lean not unto thine own understanding ~ Proverbs 3:5 ~
DX: Lupus, Sjogrens, Raynaud's, Hashimoto's and Celiac Disease
RX: Imuran, Plaquenil, Methotrexate, Flexeril, Piroxicam, Levoxyl, Folic Acid, Folgard OS (B12), Vitamin D-50,000 IU, Tramadol (as needed) and magic mouthwash (for mouth sores)