Possibly. I am assuming you had foot or ankle surgery in march. This is likely to be related but without examining you and hearing about the possible complication, it is difficult to know for sure.
Can be. The nerves that innervate the feet come from the spine (back). You didn't describe what the "trouble was". Sometimes, this can be numbness or tingling. Also, if you are flatfooted this does put strain on the back so there could be a correlation that way as well.
Surgery. If you mean you had foot surgery in march, then see your surgeon. If you had back or other surgery in march, please be more specific about symptoms so a reasonable answer can be attempted.