What Causes Pressure In The Throat And Chest After Eating Snap Peas?

My friend had what he thinks was an allergic reaction to sugar snap peas. He is known to be allergic to peanuts. He began to have a very tight feeling in his throat and a lot of pressure in his chest which he described like balancing with your chest on a spike . He forced himself to throw up what he ate a few minutes ago and the feeling in his throat has started to go away and the feeling in his chest is mostly gone. Does this sound like an allergic reaction? Is there anything he should do or watch out for? He can t afford to go to the doctor and basically refused to seek medical treatment because he thinks he s okay.