Don’t worry…it will get better. In ‘00, I was run over by a car while cycling and had a tib-fib fracture that wouldn’t grow back together with the external fixator, so 3 months after the accident, I got an IM nail in the tibia. I ran 20-ish marathons and 3 Ironmans on it in 3 years. No problems except my Achilles’ tendon on that leg is not very flexible because that ankle was in traction for a while…another product of the wreck. However, during IM Wisconsin '03, I started hearing a rattle every time I pedaled with my left leg starting at mile 80…one of the screws perpendicular to the IM nail had bored a hole in the bone and the whole thing was loose. Made for a painful walk, but I had it removed when I got home and was walkin again the next day. Your tibia will heal as a very dense bone around the IM nail.
Sorry to hear you’re going through this, but orthopedic surgeons are awesome.