Have you experienced (a health problem)?

Doctors and nurses use this kind of expression when asking about a patient's symptoms. For example:

Have you experienced any shortness of breath?

Have you experienced any trouble urinating?

The doctor or nurse can also ask "Have you been experiencing any ___?" for symptoms that are ongoing, like:

Have you been experiencing pain in your lower back?

A patient can also speak this way toward the doctor:

I've been experiencing some memory loss.

And finally, you can use "experience ___" for other problems that are not health-related. For example, on an airplane:

Ladies and gentlemen, we're experiencing some turbulence. Please return to your seats and fasten your seatbelts.

heart palpitations

Problems with your heart beating too quickly, skipping a beat, or not beating with a steady rhythm are called "heart palpitations".

You use the phrase "heart palpitations" when describing this feeling to a doctor or nurse, or when telling someone about your medical problems.

If your heart beats strangely because of a strong emotion like fear or excitement, it's more common to use phrsases like "my heart was racing" or "my heart skipped a beat".