My heels hurt if I walk I stand for more than 15 minutes continuously. It's not a severe pan so I do it anyway but I do not feel as comfortable as I used to do

My heels hurt if I walk I stand for more than 15 minutes continuously. It's not a severe pan so I do it anyway but I do not feel as comfortable as I used to do 1-2 years ago. I am 27. In Bangalore. I've seen doctors here. All of them I don't have plantar fasciitis and so, but failed to pinpoint the reason. Doctors in Manipal kept me waiting for 6-7 months for the camera in their dynamic gait analysis machine to be fixed. More than an year and it's till not fixed. They anyway wanted to give me some silicon gel or other thing in my shoe to compensate for my high arch. Then I saw a physiotherapist and he said there's no problem I just need to do some stretching. Didn't help either. So, I started seeing doctors on this "Standing vs Sitting" phenomenon on Internet which gained fame in last one year. They all said it's bull.