Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain it seems that you are suffering from constipation and burning and pain on straining inside the anal canal seems to be due to formation of anal fissure secondary to constipation.. Anal fissure is a tear in the anal mucosa that leads to severe pain while evacuation of bowels and at times spontaneous pain is also present.. I would suggest you to consult a Proctologist and get evaluated and he can do a clinical evaluation and also advise anoscopy.. You can be advised to take a high fibre diet that includes green vegetables,fruits and salads.. You can also drink plenty of water.. Take stool softeners like Docusate and laxatives like Poyethylene glycol.. Do moderate workout and take walk after meals.. For anal fissure applying ointment containing Calcium channel blocker like Diltizem, sitting in warm water tub or sitz bath and avoiding spicy meals can relieve.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.