I Have Had Some Pains In My Chest. It Felt

I have had some pains in my chest. It felt like it was knife poking me in the ribs. i thought it was just my ribs. It required me to hold my breath or slow down my breathing and take shallow breaths. it would last about 10 seconds. a few moments ago it was stronger and felt that i could feel fluttering/twitching that I felt below my ribs. Should I be seeking immediate help?