I miss one day and there are over a dozen pages to catch up on!
Nurserys - our toddler doesn't have her own room (still in with us and will then move to share with her sister) so the baby definitely doesn't. And if the toddler isn't sleeping through soon enough, we might end up having to have toddler and baby in our room. Poor DD1 is desperate to share a room too.
Prams - I know nothing about them at all. We were loaned a really old (possibly from the seventies) silver cross for DD1 which we used a little bit although mainly just for sleeping in when we went away and were given a pushchair which we used occasionally as a garden seat and threw out recently as we discovered it had gone mouldy in the shed.
Maybe, you've probably already said but are you on medication for your sickness? Over the course of four pregnancies with hyperemesis I've had seven different antiemetics and most weren't effective or weren't effective enough (I've never been so well as I am this time - I'm still amazed I am capable of looking after a toddler while pregnant) so even if you are, it is worth seeing if they can give you something different or combine meds if you are still bad. You don't have to settle for just not vomiting uncontrollably. (I really regret not having pushed last time for the medication I have now as it could have saved me spending eight months in bed.)
Pram it sounds like a very difficult/complicated situation but I would agree that your baby should be the one with their own room rather than the stepson who doesn't live there and it seems like everyone else has already made useful practical suggestions. I hope you are able to get something satisfactory sorted out soon. And if something is only available second hand and it something a person would really like then it shows that you have gone to a lot of trouble to get it so not bad form at all.
I really want custard doughnuts now!
Hot I don't know why you can't take immodium - some things it's just that they don't know and other things it's because they do know that it can have harmful effects but a good way of getting an idea is to google "[drug name] in pregnancy" as if there is any research it will usually come up. Or phone NHS direct.
Scans - I was going to go for a private one at around 30 weeks if we didn't get the growth scans as last time the extra scans were really helpful for reassuring DD1 but we've got the growth scans so don't need to now. (She worried due to a combination of previous loss AND the MW and her supervisor deciding to give descriptions of potential labour complications in language a five year old could understandwhen they came to do the home assessment.)