Why dermographism is easier to explain than tachycardia

so here’s the thing that frustrated me last month. i had a flare where i got flushed and some dermographism on my arms. my partner saw it happen, watched the welts rise. we could both point at it. but the same flare had my heart going 140 bpm for like twenty minutes and when it stopped, there was… nothing to show for it. just me saying “i felt this” and him not really getting it. the visible stuff - dermographism, urticaria, flushing - those are explanations that work… you can say “see, mast cells” and people nod. but the tachycardia? the way your chest just does its own thing? i spent two months tracking it before my doc even took it seriously, and even then i had to show her data to prove something that felt catastrophic in the moment… i take H1/H2 blockers for the reactions everyone can see. the cardiac stuff still happens sometimes anyway and there’s nothing to point at, no rash, no mark. imo i’m trying to get better at describing the physical feeling (chest pressure, dizziness, pure fear) but it’s not the same as showing someone. anyone else struggle more explaining the invisible stuff? like, how do you make someone understand a symptom that’s already gone?