Prolonged numbness

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I have a medical question regarding numbness.
>inb4 ask a doctor
I did a few days on the AT last February during which I was rather under-prepared. During the first (and coldest) night, my feet went numb. The temperature fell to about 12F that and we received about 3 inches of snow. The next day, I regained feeling in my right foot after a few hours on the trail, but my left foot remained numb. Over the next few days, I did not regain any feeling in my left foot. After the trip, I expected that everything would return to normal after a shower and rest in my own bed. To my surprise, I still could not feel anything. It took another 3 days at home until the numbness finally went away. While my feet were numb, they showed no difference in temperature upon physical touch. I'm planning a few winter trips soon, so I want to be sure I'm not causing any nerve damage/anything that will permanently harm me.
Any input would be greatly appreciated. Thanks.