Constipation issues-doc wants xray?

Hey everyone, for the past week or so I've been severely constipated, despite taking miralax, senna tea, colace etc. When I do go it is only a little amount and very soft, and I feel not totally evacuated, I also get the urge to go but its just terrible smelling gas. My stomach has been bloated and hard for 5 or so days, with minor pains around my belly button or bad gas pains. I have been waking up sweating, been a little nauseous and have two small cankers on my cheek/lip. I finally called the doctor just for advice and he wants me to come in for an xray, labs, and to be evaluated. Could this just be an IBS thing or is it not normal to not be cleared out since I was taking all that laxative stuff? What if they don't find anything? Thanks in advance

Thanks gumby. He wanted me to drink mag citrate or take an enema but i ended up taking ex lax and i finally went/ had diarrhea. I hope the tests aren't for nothing ha.