I have CFS .
Yesterday, DH, myself and almost 3yr old DTs travelled 5 hours to visit PIL.
We are staying the week . PIL know I have CFS .
We left early morning and arrived around lunch time . I was very tired and aching head to toe when we arrived.
MIL then announced that she had booked her and I an afternoon tea . I was so exhausted but I went as she had obviously put thought in to it and had paid .
The afternoon tea went on for 3 hours ! I could barely muster the energy to talk by the time we got back .
I was hoping to rest when we got back to theirs . DH had already put the boys to bed .
Then MIL announced that we were going to have a takeaway and watch a film . I could have cried . I could barely walk by now . I apologised to PIL and DH explained to them I needed to rest . MIL looked disappointed but didn't say anything.
As DH went to get our luggage from the car , I overheard PIL talking saying (paraphrasing) "surely dreamcloud could have managed another couple of hours . We haven't seen them for months. I hope she's not planning to spend the week in bed and expect us to watch the twins ...... I keep wanting to tell her if she just lost a bit of weight this wouldn't be happening... "
For the record , I'm a size 14, I used to be a 10 but since having the twins and CFS , I've never lost weight . I don't think I'm morbidly obese but MIL keeps asking how my appetite is , have I managed any exercise etc 
I feel so annoyed and gutted actually . We get on well and I feel a bit hurt .
PIL have planned a day at the zoo for today and I'm so exhausted I don't think I can go - but they will obviously not be happy .
What do I do ?
Help 