Why are you so dissapointed?? That 6.5kg is GONE - COMPLETELY DISAPPEARED. Look at where you are now compared to 12 weeks ago - compare your photos and be proud of this big achievement. Aren't you glad you're where you are now and not where you were 12 weeks ago?
I'm all for for demanding more from yourself, but don't be discouraged by what you haven't achieved. Be encouraged by what you HAVE achieved and what you will CONTINUE to achieve.
I also think you deserve a lot of credit, leading a very busy lifestyle yet still managing to lose over an average of half a kilo a week on a regular basis! Appreciate the fact that you haven't used this busy lifestyle as an excuse and have been very proactive in your quest to a better body.