Even though i am not over weight (121 pounds and 5 ft 1 inch), can overeating irritate my asthma? i am a compulsive overeater.

May be: a full stomach may exert pressure on your chest compressing the already tight airways,another mechanism is through acid reflux, but you might not suffer from so long you are not overweight, moderation is the key, frequent small meals better than less frequent big meals, and you can gage yourself accordingly, but watch out, you can easily become overweight if you don't watch your calories