Head Pressure

I don't know if I am posting this in the right place or should I have posted this in the IBS section. but I been struggling with acid reflux, gerd, gastritis or whatever you want to call it. (stomach issues) I had tons of blood work done all normal, I had a endoscopy done back in june and no signs of cancer , no ulcers, no bleeding in my stomach they did however say that my stomach lining was irritated (inflammation). so I went to my primary doctor and she said my symptoms are IBS related. some of the symptoms I get are feelings of being bloated, after bowel movements I feel full my stomach hurts after bowel movements, I get head pressure and stomach pain at the same time and when I get the head pressure I feel a lot of gas coming up  but I cannot burp. is all the gas causing the head pressure? I also have severe anxiety. I actually went to the doctor today and all they did was draw blood yet again and all normal.