When I was around 30 (long before my son was born) I stood for long hours in my job. My feet started hurting like you describe in the morning when I first got up. They would settle for the rest of the day. Then my hands started going numb on the steering wheel of my car. My hands worsened horrifically during my pregnancy and that was my EMG time with a rehab doctor that I was referred to by my OB.

Things got much better after I delivered, but I still had some foot and hand issues. I wore the wrist splints from the rehab doctor every night. But I could once again do most things except for hand work (crochet, sewing). So I avoided the suggested surgery for carpal tunnel.

It wasn't until I received my hypothyroid diagnosis in my early 40's that I realized this was all thyroid related. On the medication (levothyroxine), both feet and hands improved dramatically. My feet had grown numb by then, and so woke up and tingled/burned for almost a year and finally settled down.