For about 1 week, I have been feeling very tired?

Yes, it is possible that changes in your schedule, increased anxiety, or stress could be contributing to your fatigue. It's important to focus on improving your sleep hygiene and quality, which can include avoiding screens before bedtime, establishing a consistent wake-up time, keeping your bedroom for sleep only, avoiding naps during the day, and engaging in physical activities. Additionally, psychotherapy can be effective for managing anxiety and insomnia. If these strategies do not work, it may be helpful to consult with a healthcare provider for further evaluation and support.