Moveable lump in stomach when I lay down

I'm having the same issues I'm a 28yr old female and I recently start having sharp movements in the stomach. I will eat something and then I can see my stomach moving and I press the knots on where there moving. I recently and a rapid weight loss which I hadn't notice but a lot of people have. I lost about 25lbs and still dropping weight today. My stomach would inflat one day and the next be flat. I'm lost and worried at the same time. Please someone help.