I'm a 21 year old male without any preexisting conditions

Patient : I'm a 21 year old male without any preexisting conditions that I know of. I have felt what I believe are heart palpitations in the past (feeling a "thump" in the chest/throat), and experience maybe 1 or 2 a week. Today, however, I have experienced MUCH more than I am used to. I noticed it while walking to class this morning, I felt palpitations that didn't seem to go away for the rest of my walk to campus (several minutes), feeling palpitations for several seconds, then feeling okay again, then back to palpitations a few seconds or minutes later. One I got to class and sat down, everything was back to normal. I felt no more palpitations for roughly 3 hours. When my class ended and I walked to the library, I once again felt a few more palpitations. This again stopped when I was back sitting. This has repeated on and off all day, where I have felt normal when sitting (with a few palpitations all day), but with a very irregular number (at least one a minute) of what I'm assuming are palpitations when I am walking. I'm concerned as I have never had a day where I felt palpitations anywhere near as frequently as I have today. As I indicated above, I have never been diagnosed with a heart condition, although I have spoken with my GP about feeling palpitations in the past, and once wore a 24-hour holter monitor during my teens, which raised no serious concerns. I have a fairly significant pectus excavatum, and I'm unsure if this might have anything to do with this. I'm unsure what to do from here. I have not felt any lightheadedness or significant pain or pressure in my chest, which leads me to believe that this is not an emergency, although I will be more concerned the longer this goes on. Is this something that can wait until I can see my GP, or does this warrant a clinic/hospital visit?
Symptoms:  Heart palpitations
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