Sharp Stomach pains?

Hello, I am a 21 year old female 95lbs. Latley I have been having some intense sharp pains in my stomach and abdomen area. They sometimes go to my lower back and are all over my stomach area into my ribs. I get these sharp pains sometimes when I have not eaten in a couple hours and when I eat the pain gets worse. It almost makes me unable to walk so I must lay down or sit. I also get very gassy after I eat anything, so I tried some gas medicine but that doesn’t help. Along with tums, or pepto bismol. I find some relief by laying on my stomach and my bank with a acupuncture mat (plastic spikey thing you lay on) But it returns if I get up too soon. Laying down and sleeping also relieves the pain. Does anyone have a idea what this might be? Happens always at night for the past week now.