Hi, Can I Answer Your Health Question? Please Type Your

Hi, can I answer your health question? Please type your question here...hi! I have been traveling home from vacation today and while riding, I had a sensation of arrythmia (slight fast), not treated and I have mentioned it to my doctor in the past and he isn't concerned. This happens a couple of times a month and is over in 10 seconds or less. Today, it happened, except with it was chest pressure (that whole elephant on your chest) and pressure in my head with light headed news and dizziness. No pain, just pressure. It was over in 10 seconds. It was different. I am planning to make an appointment with my PCP on Monday but didn't know if this sounded more emergent? I hadn't had a lot to drink today and didn't know if it could also be due to dehydration. I am resting and drinking water now!