Recurrent abdominal bloating and eructations. Need help with the diagnosis

Medical Case Details:

32 years old male, software engineer by profession, complains of recurrent abdominal bloating and eructations. Pain all over abdomen due to bloating. No tenderness. Cannot pass stool satisfactorily. Feels as if stool has not completely passed. Sometimes gets urge to pass the stool but cannot pass. He is involved in some physical activity (30 mins to 1 hour) every day like walking, and work out. He usually eats home cooked food, lots of fruits and vegetables. Diet also includes non veg food and very occasional alcohol. This seems to be chronic but at least he would pass satisfactory stool every 2-3 days of unsatisfactory stools. However, since 2-3 weeks the sensation to pass the stool has reduced.

4 weeks back he has injured his back while workout which has lead to Sciatica pain, radiating pan from buttocks till the foot with tingling and numbness. Some medication, physical therapy and heat/cold fomentation has reduced this pain to some extent.

My question is, is there any chance that lack of sensation to pass stool is due to the sciatica or nerve compression anywhere in the lower back? Abdominal examination is normal and palpation, percussion and auscultation - normal.
What can be the diagnosis in this case?

Any advise would be helpful. Thanks