Mistakenly dropping the Quraan

I have disrespected Quran many times. Most of the time it is unintentionally. But it happens many times. Such as today, I was reading Quran keeping it over two pillows and while reciting, it suddenly dropped down and touched my feet. My eyes were closed because I was reciting from memory. Many times the Quran Sharif dropped from my hand. I unintentionally touched it without wudu and it was touched by my feet one more time in my life when I was young. What do I do since it burdens my mind?