You need to tell your pdoc and therapist about this. You're in a terrible pattern and need to get yourself out of it. Soon you'll get used to that dose of seroquel if you are taking it often and it wont knock you out anymore. Soon you'l start to notice how retarded the extra dose is making you. Abusing your meds is never going to help you. If you do not feel they are working talk to you pdoc to get them changed. Although if you take them incorrectly theres not much meds will do for you long term. Your therapist may need to do more intensive sessions with you.