Although it is impossible to say for sure what is causing your headaches without examining you in person, there is a small chance that you may have developed TMJ due to a change in your bite after having the implant placed. I recommend visiting a neuromuscular dentist to have your jaw examined...
I had a flipper to replace a front tooth as a teenager. I had a bone graft done and was able to continue to wear the flipper. I even wore it after the placement of my implant. I was never without a tooth during the process. If the flipper doesn't fit after the bone graft procedure, it can be...
It
definitely looks like the area is infected. Bone loss is not a good
sign. Most likely the implant will have to be removed and the area
cleaned. It is
ideal to have a 3D scan taken to have a more accurate diagnosis of
bone loss. Then have the bone graft placed again and
let the area heal...