Could the leak in my saline implant cause me to have seizures?

The saline used to fill breast implants is the same as you would get in an intravenous so there is no reason it should cause medical issues of any type in the event of a leak. Many years ago before the use of closed fill systems became the standard, there were a few cases reported of fungal growth in implants because the saline was left in an open container before filling. I have not heard of a case of this in more than 20 years and it seems very unlikely to be related. 

Assuming your implant space is sterile and the implants were filled with sterile saline, I am not sure how the "leaking" could be causing your physical condition. I would think that if there was something harmful around or inside the implants you would be having a more serious reaction. If everything else has been ruled out, removing the implants is obviously the next step. Best of luck!

Surgery to replace your implant should not cause seizures, however, the stress of surgery and certain medications could lower your seizure threshold.The surgery could be performed using IV sedation which may have less risk of triggering a seizure.