Trismus can be because of many reasons. But needs evaluation.
Need to ask you few questions regarding your problem.
You need some medicines.
Next Steps
consult me for better evaluation and treatment.
Health Tips
avoid spicy food.
take soft diet avoid solid food.
avoid chewing gum...nail biting
don't smoke if you do.
avoid alcohol.
drink plenty of water.
heat therapy (placing moist hot towels on the affected area for 15-20 minutes every 1 hr)
don't self medicate.