Doctor gave me laxatives for constipation when i had abdominal pain and was crapping way more than i normally did and it smelt like death i also had occasional diarrhoea. is this a normal prescription? he wasn't really a great doctor so?

You should provide us the laxative name. People reacts to laxative differently but your experience is not uncommon. You are young so you better fight constipation with diet (fluid intake 2 liters a day + high fiber) and exercise and avoid certain foods or drinks which can exacerbate the condition. If you do not want to eat fiber then you can take fiber supplement in health stores. Good luck.