Can i take miralax laxative in morning and fleet enema in afternoon and if they do notwork can i repeat process the nextday?

Depends on details: Each person with constipation needs to be sure there is no other disease causing it. If constipation is just due to slow movement of the food and poop through the gut, some things to try are vegetables, water, prune juice, prunes, fiber-with-water, Miralax (polyethylene glycol), Senokot or other senna, milk of magnesia, other laxatives... A daily enema usually may be done for 1-3 days if needed.