What am I doing Wrong?

I have always prided myself in having healthy kids. I feed them healthy food. Give them only water and milk to drink with an occasional sip of Apple Juice. I give them vitamins and get them moving and active. They have been so healthy that we haven't had to take them to the doctor except for well visits for YEARS...UNTIL NOW.
This past month we were in the doctors office seven times. I had four out of five on meds at one time. From out of no where sickness hit us an hit us HARD. Round after round... Child after child...It was a ROUGH month. At one point, as I was loading up medicine spoons before bed I was praying and actually said, "Lord, I've always been able to PRIDE MYSELF in having  healthy kids. I've always done such a good job. WHAT am I doing wrong now?"
Immediately this verse came to my mind. Psalm 34:2 "I will boast only in the Lord; let all who are helpless take heart." I've been boasting in myself for the health of my kids, but the Lord wants me to boast in HIM. To see it as the blessing that it is that HE has allowed my kids to stay healthy all these years. I am thankful, indeed. A good reminded for this hard headed mom.