Sorry that you've had to join the rest of us on here, and that you're in the whirlwind part of diagnosis and treatment.
Just wanted to reassure you it does eventually slow down and not be all about appointments.
I have just finished four rounds of chemo three weeks ago, and start on my amritose inhibitor today. No more appointments for 8 weeks - yay!!!!!!
I don't know why your GP has told you you can't go back to work. This is a very individual thing but I worked right through my chemo, having it on a Friday do I could spend the weekend doing zip. For the first two rounds I felt pretty muc normal; round three the fatigue hit me every day for three weeks but I still worked through it; and round four I went back to work the following day and haven't stopped.
Perhaps take a wait and see approach. If you have a supportive employer consider a part time return if that will work for you.
Wishing you all the best for next week and beyond.
x