Hi There, Im 43 Yr Old Woman , My Stomach

Hi there, im 43 yr old woman , My stomach is really bloated as if im 8 months pregnant. Its hard an sometimes tender. It causes pain, pushes against my lower back & my bladder. Ive had colonoscopys , an ultrasounds vaginly & on the outside on my stomach area. Ive had ct scans an also a barrium drink test that lights up my insides. They turned out all ok. But why is my stomach bloating up so huge an hard , causing pain. ??? Im not over weight , i dont eat dairy food, an i try to eat healthy. I stopped having periods 5 yrs ago, my mom & gma started the change early. I look like im pregnant, im not, but why is this happening. If i could i would send a pic of how bloated i am. I do only Poop 1-2'times a wk. Can you give me advice on what i may be having going on? What foods should i avoid? Or drinks to avoid. I dont drink alcohol, nor do drugs. Im in need of some good advice.