Is it burnout? Have you felt changes during vacations 3 weeks+? If you can afford it, maybe ask your employer for two or three months off unpaid, if you sell it as burnout prevention, it should also be in his interest.
Then get some sleep medication and do what your body tells you to.
I use blokada. I have no idea how it works or if is safe, but I haven’t seen an ad even in apps since I installed it