Schedule an appointment with your veterinarian as soon as possible. These symptoms could be indicative of several things including, but not limited to gall bladder stones, urinary tract infections, hormone imbalance, tumors, internal injury or possibly something as simple as age making certain positions and morning rising uncomfortable. Older dogs experience more aches and pains just like people. The swallowing a lot could be indicative of any amount of glandular issues or in response to his discomfort. A veterinarian can perform all of the necessary test to effectively diagnose and treat Roscoe. Most likely this process will begin with a general physical exam followed by blood work or testing of the urine. If necessary, the next step would be an ultrasound if those former tests revealed nothing. Best wishes to you!