I was walking from work and suddenly started to feel dizzy, and my hands and legs fell almost numb and heavy, also I started to sweat profusely, and my heart rate rose to 148 Bpm. It lasted for less than a minute, but still the sensation was really strong.

I went to emergency room, and they said it's probably just my nerves. They didn't evend do ECG... I feel fine now, but what the the fuck do I do next?