Yes A Couple Years Ago I Noticed I Get Really

Yes a couple years ago I noticed I get really bad stomach pains when I lay down its only at night when I lay down it hurts instantly so now I sleeput in a chair it hurts so bad it wakes me up at night and it's throbbing it usually takes 10 to 15 min for the pain to go away can u help me and tell me what might be going on