Hi. Thanks for your query. Noted the history about your suffering from nausea with bloating and severe muscle spasms. Headache for at least 4 days in a week, problem in urinating causing slow stream and unable to empty the bladder completely unless you strain and push at end. Had pain around waist spreading over kidney area on back, is post-gastric bypass with scar tissues at anastomosis, also suffer from chronic and bleeding ulcers. As per the history you have provided, there are many problems: the pain and bloating in stomach, Headache, difficult in emptying bladder. Hence I would advise you the following: Urine test: Routine, microscopy, culture and sensitivity, antibiotic treatment, ultrasonography of the whole abdomen, particularly the genito-urinary tract. Opinion of an Urologist and cysto-urethroscopy to see the exact problems and get treated accordingly. our second problem is related to the Bloating and pain in stomach in a way that you have mentioned above can be due to sort of gastroenteritis. Tests of stool and blood will further help. Headache can be due to varied reasons and hence personal opinion of your Doctor, preferably a Neurologist can help. This way a proper diagnosis and proper plan of management can help.