Hi darl
Wondered how long it would take before you started to really "feel" the rads....sorry it's kicking in and you're really tired.
Like these gorgeous ladies have said - it is normal and nothing to be worried about....just try to cope the best way possible - like Tonya said - take a nanna nap (although maybe not in Coles Adean!) and go with it how you're feeling (well said Mich).
When I worked in radiotherapy I could see how the fatigue would start to hit towards the end of the treatments....but people did get through it.
Don't overtax yourself, say 'no' to things when you're tired, go to bed early - you might not sleep..but perhaps get a nice girly mag like Marie Clare or Cosmo, and read that or better still try a book (if you can concentrate) like 50 Shades of Grey!!! Not too much concentration required for that one I assure you - more like visualisation! hehehe!
Whatever works for you...just do it. You're nearly there and we're all travelling along with you.
luv H