Welcome to healthcare Magic!
You are surely not paranoid but you are vigilant.
I think the fluid is there and pain in this area seems to be indicative of an infection cropping up there in that pocket because a foreign body remained there lodged for some time.
You should revisit the surgeon/dentist
because removing the source of infection is the first and most important step in the management of infections and should be done as soon as possible.
You will need to start or upgrade the antibiotics treatment your clinician will know.
I hope the advise would be informative and useful for you.