What Causes Chest/back/stomach Pain After Delivery With History Of Hodgkin's Lymphoma?

hi i am 20 years old , i have a history of hodgkins lymphoma . i just had a baby 6 months ago and since i had him ive been getting severe chest back and stomach pains its all a once . its off he pain charts it feels like an elephant is jumping on me while a snake squeezes my in half, i cant breathe when this happend and i can only scream and cry , it also makes me vomit sometimes when the pain is at its worst. im feeling this way now. what could this be?