We are sorry to hear about that!
If it looks like this in the photograph, then it's very likely the implant abutment screw that has come loose.
All it needs is a quick tighten which takes just 5-10 mins, however, you'll need to find a local implantologist who has the right hex screwdriver (typically 0.9 mm or 1.2mm)
(not an emergency dentist - they most likely won't be able to do anything apart from an x-ray).
The implant system you have is called "Neodent (Straumann)".