Unfortunately, there is no way to determine an accurate diagnosis without a proper assessment. There is an overlap of symptoms in many disorders. For example: Someone on the autism spectrum is likely to have some characteristics of OCD. Many people with OCD also have other symptoms of anxiety and the reverse.
I’m concerned that you aren’t getting good sleep. Lack of quality sleep can increase anxiety. Anxiety can interfere with sleep. It can become a downward loop.
One of the first things you can do for yourself is learn some ways to calm yourself and clear your mind so you can rest. I suggest you learn some kind of mindfulness practice. There are a number of good self-help workbooks as well as web sites that can help you with that.
I’m glad you understand that online tests aren’t meant to be diagnostic. They are only intended to highlight the possibility that you could benefit from getting a formal assessment. COVID-19 is making getting such an assessment more challenging, I know. But do some research to find out whether any clinician near you is doing online assessments and treatment.
A place to start is with the person who gave you your initial diagnoses when you were 12. Since that person knows your early history, it may be that she or he will have some insight about what is going on now. Since you are now in your 20s, it’s also possible that you have changed in important ways — both because of getting through the hormonal storm of puberty and because you have had many experiences since then that inform your thinking about yourself.
Regardless of diagnosis, life requires that you manage life tasks. Put your research about disorders on hold until you can get some expert input. You will get the answers you seek when you can talk to a professional. Focus instead on doing your daily tasks to the best of your ability.
Be kind to yourself. You won’t be perfect at it. No one is. All you can do is the best you can do. In the current pandemic, you are certainly not alone if you are having trouble being as efficient or productive as you would like to be.
I wish you well.