gastritis???

hey ya’ll lately i have been experiencing some stomach problems for the past week. everything i eat i cannot finish without feeling bubbly, gassy or i just have absolutely no appetite at all. everything i eat i have to run to the bathroom, my diet has not been changed only strictly portion control so that i can lose more weight. i do have history of taking my gallbladder but that was over 2 years ago & never experienced this feeling. woke up this morning with a gassy stomach, it almost feels like when you’re nervous for something & your stomach starts to turn? that’s literally what ive been feeling & its not a good feeling at all. anyone know what it could be? might head to the doctors on tuesday