It is like that for most of us. It was for me as well. I think around 5 or 6 weeks in I was in bed for like 3-4 days sick and unable to stand on my feet. For the past month or so I had better or worse days but never as bad.
I think this just takes time and if the infestation is serious enough to cause other problems I think you should expect it to take long time. I know it is frustrating and all you want is to be better, but it will not happen overnight.
They say “healthy person has million wishes, but sick one has only one: to get better!”
Focus on getting better and the anxiety will calm down a bit. Once you start feeling better, it will get easier to continue.
Best of luck to you!