No, allergies would not result in a deviation of your nasal septum.The septum can warp or shift and therefore, redeviate after septoplasty, so that's more likely what has occurred in your situation if the septum is indeed confirmed by a nasal surgeon to be deviated at this point.
Hi there! After septoplasty, you can certainly walk and move around. You want to restrict bending or straining including lifting anything heavier than 10 lbs for 2 weeks. Noseblowing or picking should be avoided during that time. Exercise should be limited to nothing that will raise the blood...
While training varies among providers, you may consider evaluation by a surgeon who specialized in rhinoplasty procedures to address the cosmetic concerns. Talk with your health care provider for a recommendation on how to proceed.