I'm so glad you're home again, meg, there's nowhere worse to be than hospital if you can avoid it, especially for kids.
I think those plastic things are called 'venflons' although I don't know how to spell it. Dd hated hers so you're glad he thinks it's a bit special!
meggle, I still don't know how old your ds is. My dd was 3 1/2 when we had our scare with her.
I think you need to start asking them lots of questions tomorrow like what they suspect and why they're doing an MRI and CT which indicates that they're looking for something specific.
When we were in with dd they gave me a list of things that they thought it might be from the downright scary to the nothing-to-worry about like a post-viral weakness which is apparently quite common. Dd had had a nasty flu about 6 weeks before and they thought that could have caused it but in the end it turned out to be this Perthes Syndrome thing which one doctor had mentioned to me even during our first evening in A&E.
I hope you get a good night's sleep and that tomorrow brings you much peace of mind.
Thinking of you xxx