I suffered a distal fibular fracture with slight widening of the mortise 7 weeks ago and i am weight bearing as tolerated. when i put full weight i feel it hurt under the lateral malleolus. is this part of my break or something else?

Any widening of the ankle mortis can make you susceptible to irritation and later arthritis. You are at a young enough age where repairing the anatomical ankle mortise is important. You do not have a lot of time to get this evaluated before destruction of the joint is irreparable. You might want to see a second opinion for something like this. without viewing x-rays decision is impossible