I have had it twice. The first time I thought it would never go. I tried everything mentioned here and more. Eventually one steroid injection got rid of it within a few days.
About 5 years later I felt it coming on again and used the methods which had worked best at relieving the pain and it disappeared within a few months without ever getting to the not wanting to stand up stage.
From my experiences I suggest, first of all, in the morning before getting out of bed lie on your back and stretch your legs making yourself as tall as possible. Point your toes then flex your foot downwards, hold, then upwards as far as you can and hold.
Never go barefoot, find shoes which work for you. I found FitFlop shoes, trainers and sandals worked for me.
I tried special insoles, including Scholl and found all helped including the ones from Lidl and Aldi which were brilliant at a fraction of the price.
My daughter in law sent me silicone heel things, like toeless socks which had helped her and they did provide relief at a very low cost.
Good luck. The pain can be excruciating.