Having bad hunger pains with lower back pains swollen stomach and thumping in lower stomach. Help?

Define "hunger pang" Sensation of hunger is related to contractions of stomach muscles, that lead to hunger pangs once they become severe. Are triggered by hormone Ghrelin (released if blood sugar levels drop with prolonged periods without eating). Hormones Peptide YY & Leptin cause the reverse--the sensation of being full. Irregular meals make hunger pangs worse. If real pain, get evaluated please--U sound concerned.