I think if this is working for you then you should keep doing it. Could it have been that you were just having a rough day? Are you getting enough sleep lately? Sleep is very important to your overall health.
Something to mention, smoothies can be very high calorie. I am sure that you are making yours a specific way. However, smoothies contain a lot of sugar and it is a common misconception that just because fruit is good for you that the sugar it contains is. Fructose can still wreak havoc with your blood sugar. So be careful and good luck dear!