Could the tasks that you haven't finished be "whispering in your ears"? Oh yes, especially since unfinished tasks cause a unique stress load on your cognitive system and this load causes imbalance.
Take on items 2 through 5 following the same "task analysis" procedure. Break the task down, determine the materials needed to finish it, set a time line and begin AND finish it! Avoid starting any other projects until one is complete, otherwise, Zeigarnik will start nagging you. Success breeds success.
When you practice the process of preparing for and starting and finishing a task, you'll begin to define yourself as someone who "gets the job done". It's a matter of being aware and self-training. You'll teach others that they can rely on you and that you are a responsible person. You'll feel more confident, competent and whole. Anxiety will decline and self-respect will increase.
This is a process. If you fall down, don't panic. Pick yourself up, rely on your training and go forward. You can do this.
Use the Zeigarnik Effect to improve your study skills. When students take a break from studying and engage in unrelated activities, they'll remember the material better than those students who don't take breaks or who "cram" the night before.
Keep up the good work! TTFN, Claudia