my ex-bestfriend is ignoring me. I’m concerned about her and I’m afraid of losing her. She’s like an ex that I miss. Im also drowning I coping in work and I don’t feel asmuch joy in the things I like as I used to.Im constanty struggling to pay attention class ( I have adhd) and don’t understand how to to the work.
Thank you for reaching out. From your sharing I can see that you have several things that are affecting you all at once.
Firstly, it is understandable that you feel hurt because a friend you care about is distancing herself. I believe she means a lot to you. May I suggest to consider reaching out in a low pressure manner, by gently checking in how she has been and that you are looking forward to catching up. Then give her space.
Reading about the numbness and overworking, I sense you may feeling burnt out. If possible take some rest and re-centre to recharge. Slowing down and being more present will also facilitate better emotional regulation and focus. Break down tasks to smaller chunks and start by allocating just 10 minutes to each of them. I have noticed getting started after we have been stuck is usually hard so be gentle with yourself as you overcome the initial inertia.
With ADHD and school, make everything smaller too. Start with a few pages, answer a few questions. Ask for help early and tap on resources available.
Taking action will help so I encourage you to take that small first step forward. With consistency and patience. 
Thank you for reaching out on this platform. I hear that you’re worried about losing a close friend, and you’re also struggling in your work. I also hear that you don’t feel the same joy you used to on the things you liked. I’m sorry to hear how much you’ve been struggling, and I’m glad you reached out on this platform.
For your friend, it’s understandable that you feel worried and hurt that she’s distancing herself from you. Like @CaringBee suggested, maybe you could try reaching out to her and see what she says.
With regards to your work, maybe you could try taking a step back and taking small breaks as you study. It’s perfectly fine to do so, and it could even help us be more productive. Other than the things that @CaringBee suggested, maybe you could also try booking a consult with your teacher to teach you the concepts you’re struggling to understand? If not, maybe you could study with friends and ask them for help. Would you consider trying these too?
Know that you deserve kindness and we’re here for you 