Boxer with distended stomach and pale gums

******Urgent Please******CAN NOT AFFORD UPGRADE

[Editor's Note: Questions are delivered to Dr. Marie in the order in which they are asked. No priority is given to urgent questions as our free questions are not screened prior to delivery to the vet. If you need an answer urgently you must use one of the paid options (available for as little as $5.00) ]

My 9yr. old male boxer has a distended stomach, has had for the past week now. Has had one bout of bloody diarrhea. Tongue and gums are white. he yelps in pain when he moves wrong. Not producing to much stool at this time almost like squirts of runny diarrhea orangish in color. He's very alert, happy, eating, urinating fine, not taking in water to much. Upon sleeping he's seems to have somewhat of labored breathing and very snorry. 6 months ago he was vomiting a lot of whole dry dog food and would drop unconsciously after a bout of coughing and choking happened 3 times. We switched to soft food and haven't had a problem with that since. The vet confirmed that his gums were real protruded over his teeth, so that caused a problem with chewing. Current Symptoms of distention and pain has me worried. Vet is trying to convince my husband to either allow him to pass away at home or if he is in to much pain to bring him in to be put to sleep. No x-rays or blood work have been done yet nor have they even felt on his stomach. Temp is fine, yesterday mouth coloring was fine. I want a second opinion on what the possibilities are that could be going on. the vet seems to think it could be his spleen and paying out the money for x-rays and blood work could be a waste of our time if he's dying anyway. I keep thinking it could be something simple to. I need reassurance, so I can convince my husband to go ahead with the x-rays. Could it be worms in the stomach, or fluid, or what about an object? Please help I'm trying to advocate for my animal and preserve his life if I can.
Thank You,
Mrs.Havens