Pedalmonster sorry to hear you are suffering so badly from MS still, although I think its safe to say its more like hyperemesis if its past 12 weeks and its still bad. I finally got medicated at the weekend (although it was reluctance on both mine and the Drs part not just him), and it has made the world of difference. I did not realise that the sickness had a hold of me to such as an extent. I mean I did, but the change is unbeleivable. I actually laugh a bit now, and forgot how little i laughed. I can be bothered to make myself presentable again, and have so much more energy even though I am very tired with the medication I am on. For example i have just cleaned the car. it took me 2 hours (was filthy and the smell of it was making me heave, even though DH 'cleaned' it last week, not to my standards oviously) and I now need to sleep for 2 hours to recover But this time last week I could not even clean myself. We are even going camping this weekend, only for a day and a night, but still, gets us out. I am thinking like you, need to get away in some fresh air.
I think you should talk to your Dr about sick note for work, for a couple of weeks, then definitely go away for some recovery time.
I am very lucky with DD. She does have tantrums and is of course demanding, but her tantrums are minimal, the reason usually clearly identifiable - tiredness, hunger (usually a combination of both if she gets upset) or more recently boredom. She is able to communicate fully with us, which I agree makes a huge difference. When she was learning to talk she more tantrums as she was struggling to get us to understand but now she can talk better than me half the time! She is demonstrating the most amazing compassion and empathy, very surprised to see it in such a little person. She has really looked after me while I been ill (sometimes, as I am literally being ill, as I am unable to tell her to go away!!!)