LUMP IN STOMACH AND NOT PREGNANT

I HAVE A LUMP ON THE RIGHT SIDE OF MY NAVAL THAT HURTS WHEN I DO STRENUOUS ACTIVITIES..IT MOVES AROUND BUT STAY ON THE RIGHT SIDE.I WAS AT WORK YESTERDAY MOVING SOME THINGS AROUND AND IT STARTED HURTING LIKE I WAS PUTTING TOO MUCH PRESSURE ON IT..IT IS NOT OFTEN THAT I LIFT AND MOVE THINGS AROUND BUT WHEN I DO IT HURTS.A FEW YEARS BACK I HAD AN OVARIAN CYST SURGICALLY REMOVED FROM MY OVARY, I DON'T KNOW THINK THIS COULD BE RELATED BUT THE THOUGHT HAS CAME TO MIND A FEW TIMES....EVEN IF I JUST TOUCH IT IT HURTS...CAN ANYONE HELP ME..LET ME KNOW WHAT THIS IS.. please