Hello! I can totally understand the magnitude of the issue that you have brought out here. Sleep disorders are a long list of problems where insomnia is the most common form it. Your current profession and work from home, long duration of work hours, and prolonged exposure to the laptop and phone screen could be potential reasons for your sleep related issue. More over your feelings of being stressed, low, and anxious could very well be an issue of COVID19 which is exacerbated by other work related issues as well.
Next Steps
Should get in touch with a Clinical Psychologist for more clarity and psychoeducation
Health Tips
Could browse for "Sleep Hygiene" practices and you can start following the steps.
Physical activities (walk within home, simple strech, yoga, etc.) could be included on your daily schedule
Reduce your caffeine consumption after 6 pm
Sleep in a well ventilated room
Use the washroom before hitting the bed
For more details get in touch with a Clinical Psychologist