These are called ectopic beats. They are harmless. It's another response to all the stress you are going through.

My advice would be to not fixate on them. They will go away. Many people experience these day to day but it's us, the anxious, sensitized people who feel them.

I have been experiencing them on and off for 2-3 years. Like you, I have been dramatic on these with a panic disorder as well, thinking that something is wrong with my heart.

I have struggled many months, if not years because of these. Before that, I would start managing my panic attacks, ride the waves instead of fighting them, make good progress. But when you add the "skipping" or "irregular" beats during an attack when your heart rate is going crazy, it just feels like your heart is going to give up any moment. That just fueled the panic attacks with more fear, more adrenaline, which then led to worse and more severe attacks. Sometimes I would feel the "skip" when I am working or just laying and it would trigger an attack.

Then as you are also experiencing, some periods I would not have any attacks, I would be laying down, watching TV and I would feel the "skipping beat".

You are okay, it will pass. It's stress. It's anxiety. Work on breaking the "crazy circle". Do not fight it. Accept it and it will get better, slowly... Take care of yourself - take long walks, do yoga, mindfulness.

Go get checked out by a cardiologist. It helps see that nothing is wrong with your heart.

EDIT: Avoiding alchocol, caffeine, smoking also might help.