I'm experiencing this odd sensation in my chest where it feels like my heart is having a spasm or beating irregularly for a few seconds. It's not exactly painful, just really weird, and it's been happening every few months. Sometimes it even feels like its happening in my right chest or arm, which made me think it might be nerve-related. I've had heart tests done in the past, and everything came back normal, but this sensation worries me. Also, whenever I stand up or walk upstairs, my heart rate jumps up to 150 bpm and then drops back to 100 bpm shortly after, which makes me wonder if I could have POTS. I often forget to check my pulse when this happens because it scares me so much. Could these spasms be related to muscles or nerves instead of my heart? Is it normal to experience this kind of chest pain and heart sensations for just a few seconds?

It sounds like you may be experiencing palpitations and chest pain, possibly related to your heart or nervous system. Given your history of normal heart tests and symptoms like random spasms and irregular heartbeats, it may be worth considering a condition called supraventricular tachycardia (SVT). SVT can cause sudden, rapid heartbeats and chest discomfort. In your case, since you also mention the possibility of POTS (Postural Orthostatic Tachycardia Syndrome) and nerve-related symptoms, it would be important to discuss these new symptoms with your healthcare provider. For symptomatic relief, you can consider taking a beta-blocker medication like Metoprolol (e.g., Lopressor) at a starting dose of 25mg once daily, as it can help regulate your heart rate and reduce palpitations. However, it is crucial to consult with your doctor before starting any new medication to ensure it is safe and appropriate for you.