Im Trying To Quit Smoking Because I Simply Dont Want

Im trying to quit smoking because i simply dont want it controlling me anymore. I tried to quit last month and was doing fine. Went 2 weeks and felt great. One day i was walking (it was extremely hot if that's important) and my heartbeat just spiked. I was taken to the hospital and they did an ekg but found nothing wrong. Now im concerned if its the withdrawals or if i have anxiety or possibly just dehydrated. But these anxiety like attacks have occurred a few times if i drink coffee or if i smoke