Life is a series of breathes and emotions. What you have done, You have done. Now If repent, do with pure heart. Don’t carry the burden. Sai know the human nature and always helps to overcome weaknesses, granting them all required strength and confidence.
If I am right, What you are facing, due to overconfidence on your powers. To win over your weaknesses at your own. A mental struggle. Time has already made a turn in your life to make you surrender before Sai. Now, Do again, But accepting Sai as your Master. Life will start changing to higher level.
Have Trust and Patience!
Everything will get settled.
om sri sai ram!