portal al end no visible

I found the ruins at the end and itched everywhere I also threw an ender pearl but I couldn't even find the portal and then decided to create a WITHER in the ruins as they easily destroy everything and didn't find it either. the debris is almost undone and my WITHER surfaced and I lost my eyes. If it marks me where that portal should be but there is absolutely nothing, it itches and itches under me and from the sides and I am fed up and there are no more corridors just a destroyed room. I wish I could find him soon