thanks for sharing your concern,
you are right it is called trismus , traumatic and long surgical extraction procedures leads to pain and trismus.
visit to the dentist
for reevaluation of your healing socket, for dry socket
condition too. if it is a case of dry socket .
it has to be treated by debridement, irrigation and placement of suitable medicament in the healing socket .
a course of antibiotic and analgesic
can also be given after clinical evaluation.
meanwhile, you are recommended to use chlor hexidine 2% mouthwash,
frequently do warm saline rinses ,
do not stop chewing, keep a chewing gum in your mouth and keep chewing, from other side. this promotes salivation.
take plenty of fluids and juices, time being take semisolid diet.
if required you can go for muscle relaxant
too eg. diclofenac
these measures definitively help.
don't worry it will be fine.