@AlwaysAnxiousAnnie
"Thank you. This is helpful, I have found that a heavy meal or even too much salt can trigger then. Specially if it's a very carby meal."
A family member has had problems with anxiety, tachycardia and palpitations this last 12 months; he did find a beta blocker helpful. He only took one or two doses on days when he needed it, so did not take them regularly.
He also has orthostatic intolerance symptoms some days and narrow pulse pressure and has found that an evening meal containing a lot of pasta seems to push his HR up afterwards, so we now limit how much pasta in one meal. Whether it's the carb load or an overly full stomach, I don't know, but a lot of carbs does seem to affect his HR. He also gets GERD.
If I have a short run of palpitations, I try singing out loud, drinking a glass of very cold water or coughing several times. (The type I have are described in one of Dr Gupta's YouTubes and resolve within a few seconds but can still be unpleasant to experience.)
Submersing your face in a bowl of cold water can also help, as the body, in these conditions, automatically reduces the HR - but I've not tried that as the palpitations resolve quite quickly.
Someone mentioned increasing exercise - even if it's just walking. It gets the body used to a normal increase in heart rate.
As others have said, a trip to A & E is unlikely to result in anything other than a long and stressful wait to be seen, monitoring of your BP, HR and temperature and possible an ECG and to be sent home with advice to take beta blockers. They won't be geared up for doing structural investigations like an echocardiogram.
Don't forget also, if you were given a 48 hour Holter monitor to monitor your heart rate at home, you might find that when you are asleep, your HR often naturally dips quite low at times and your heart copes with that every night. So I would not worry that a low dose beta blocker might send your HR too low. They are also used for people with certain heart problems to take the strain off the heart.
A low dose propranolol would take my family member's HR down from over 100bpm to around 80bpm and he'd feel a lot more comfortable.
I wish you well. Living with constant anxiety is exhausting.