Taking heavy dose of laxatives may cause diarrhea
and some times nausea
Since you have not mentioned number of episodes of motion, and you feel weak, it may be due to dehydration
So rehydrate yourself with plenty of water, citrus fruits, salt , sugar.
If possible get some ORS fluids and drink.
If your vomiting heavily and cant have any oral fluids you need to have intravenous fluids.
Also have medication for vomiting like Emeset, and anti-diarrheal's after consulting your family physician.
Wish you good health