OK, if you are going to do WIWO, you hve to do that, not just for the beginning and then going in and sleeping next to him, because he will just think, well ok then, I lay here and scream, she does that walking thingy and then she'll come if I wake often enough and sleep next to me. KWIM. If you consistently do WIWO, however long it takes, he will eventually think, well Mummy is here, she comes in to see me, but then she goes, she won't stay, ok, I might as well sleep then as she's not going to sleep with me, but at least I know that she is here if I need her. That is what we are trying to achieve.
If you do WIWO and then change to a different type of method then he will not know what is happening, that's why we must be consistent.
Hope that you do start seeing some imrovement soon, I know how hard it is. Hugs from me too.