Hello sir, Good evening, I read your whole history... Your main c/o constipation n your age is 93 year... So obviously your lifestyle somewhat toward sedentary lifestyle n constipation is result of this type of lifestyle... As you are 93 so I cannot suggest exercise programme much But still you can modify your diet plan... Like in diet plan you must include plenty of water n green leafy vegetables more which has more fiber... This helps you reduce your constipation... As you already stated that you tried lots of laxatives n you are not satisfied as I think you have less knowledge of lexatives.... Once you use lexative n then stop than you feel you have constipation but this is pseudo feeling as your colon is totally empty due to lexatives n there is time for filking it up then you have urge for defecation...so you have to wait at least 1-2 week after stoping lexatives .. If after this time of period you still have constipation than you use lexative again... As this is common old age problem n if you want use lexative for a long time than I suggest please use natural lexatives more than synthatic lexatives... As you are gone through veriety of investigation n all investigation are normal so you have no chance for obstruction cancer etc