Suggest Diet Chart And Exercises To Lose Weight Post Childbirth

i gained 65 pounds ,after i had my child , and now my son now 3 yrs old. And since then i been trying to loose the pounds i gained. and i been trying so many diet program, and now i have under active and i been taking medicine and working out and exercising but no progress at all. So plz let me know if you have any suggestions.