Wow, dream, that's way too fast! And 'let's see how it goes' followed by disciplinary - no way, that's not right!
Are these 1-day, 2-day and 3-day weeks, so you'd be back up in three weeks? My thought would be that was too fast, but you should talk to your GP and get some advice. I would think doing the lowest amount (maybe 2.5 hours on two days?) for a couple weeks to see how you're handling it before increasing. Although I'm totally not in employment or health, so do get advice.
Do you do your 3 days in a row? 10hrs is a long shift, although depending on how your illness works, it could be better to concentrate it then spread it out - or not. My husband has CFS too, and he's about 30-40 on the scale like you (summed together, me and him almost make one normal person! :) ). He deals better with small bursts of work and frequent rests. So he does a few hours, sleeps for a few hours, works a few more hours, etc. Although all his work is deskwork! He has hobbies where he sometimes goes off and stands for 10 hours a day for 1-2 days, and he totally crashes afterwards; it usually takes him a week to recover. However, for me, I find I sort of 'asymptote' - there's a point where I can tell I've done so much that doing a bit more doesn't make a big difference. So if I'm standing and cooking dinner I will do as much other cleaning, etc. stuff that I can do because the difference between standing and doing that versus just standing and cooking is much less than the difference between lying down at another time because I've done it all versus doing that extra stuff that needs to be done - if that makes sense? But my pattern would make DH much worse, as he has a much stronger response to more effort than me, so he'd do better to do two periods of lesser effort whereas I'd do better with one of more. So you need to figure out how you work best.
moose - oh no, how is your son doing now? Hope your migraine is getting better.
Hi, mushroom - they will get it sorted, it sounds adminstrative at this point. I totally understand the 'reeling from the diagnosis' thing. I'm not quite there (as no one has diagnosed me yet!) but as I'm getting closer to finding out what the actual problem is, I'm starting to feel a hint of it. It's like both a "yeah, knew this all along, why did it take so long for them to figure it out?" and "oh, crap, no, that can't be true, can it?" Because a teeny, tiny part of you was holidng out for an answer was a simple easily fixable, not chronic issue and that hope has now been taken away.
And hi, ipswich - yeah, we understand. I found myself saying today to someone today at work, "You see me standing here, but at home I'm lying down the whole time", trying to make the fact that I can't actually stand and cook a dinner make sense. And, oh, I'm missed so many tiny things at work that I worry I'm going to miss something big. Or I have, and just don't know what it is yet -- so far every tiny thing has been fixable but there is also some stuff I should have been doing and simply haven't, and I worry a bit what the fall out of that will be. Could be nothing, could be a disaster...