The possibility of having laced weed is extremely low.
I've had bad trips from weed plenty of times, about three.
My body went completely numb and I was twitching all over the place.
You don't have to go to the doctor because it was just a bad trip.
Ever since I got bad trips, I stopped smoking. I won't touch weed anymore.
If you do plan to smoke again, be around friends you trust completely.
Be in a good environment and have a good mind inset.

To get rid of a bad trip, take a cold shower, drink cold water and eat heaps of food. Bread mainly and such. Don't take pills or anything. Because if the weed is laced you don't want to add more in your system. Just relax and let it pass.

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