Often i need to have a bowel movement but the urgency to go either disappears by the time i reach the toilet or it feels like muscles won't relax. ???

?constipated: Having a bowel movement has a psychological aspect too.Use the bathroom when you are not pressured about time.You can try a daily dose of Miralax (polyethylene glycol) and increase your fiber intake too.Above all take your time.

Possible IBS: To provide the best advice we would need to have you compile a bowel diary including dietary intake as well as consistency and estimated frequency of stools. You have commented that you are not weight bearing and is this a chronic neurologic condition or temporary post procedure condition. Are you on any narcotic or anticholinergic meds. How is your urination