SLIT (Oraltek Cat)

I have several severe allergies and one of them is to cats. I'm allergic to fel d1 and fel d7. I've been takin Oraltek Cat for 4 month by now, my cat is not living with me, I'm visiting her. When I visited her yesterday I had a terrible episode of sniffing, but earlier it seemed to me that things were getting better. Who had an experience with SLIT? How were you doing on the 4th month of it?