IT Band? Is it supposed to hurt this much?

It has been about a month since I started my routine of slow jogging 5–7km five days a week, followed by a 2km walk.
Thanks to combining this with a diet, I have also successfully lost 10kg.
Yesterday, I ran 5km and then walked 2km as part of my usual routine.
I had no issues while running, and I felt fine while working at the office today... but around noon, the side of my left knee suddenly started hurting, and now it is so painful that even walking is difficult.ㅠ
I looked it up and many people are mentioning IT band injury...
Is it normally this painful?ㅠ
I am planning to go to the hospital.ㅠ