Great questions hun and ones i wish i'd asked when i had my first born. Here is my take on it.
Do you continue to have contractions? if so, for how long? How bad are they?
Like everyone has said, you have cramp type feelings which is everthing contracting to get back to normal size. I felt this most when BF'ing LO whilst at hospital and for a day or two after but it wasn't too bad, like period cramps and it's totally workable. I've heard the intensity of the afterpains increases depending on how many kiddies you've had but seeing as this is only my second, i can't vouch for that.
What happens when you are stitched up? Do they inject you/how bad is it/how long does it take?(do they dissolve!??).
I had a 2nd degree tear as my delivery was so quick (8 mins of pushing!) internally and externally. I didn't feel it happen or pain afterwards until they started to stitch me up. I had gas and air for the stitching as they tried to numb me with injections directly into the area torn BUT i don't respond well to local anaesthetics like that (they don't work at the dentist either!) so it didn't work properly. It stung a heck of a lot but was over very quickly even with a big rip like mine - i'd forgotten all about it by the time they'd finished! Mine dissolved and i healed perfectly.
Do they take blood tests from you after?
I don't remember any bloods being taken, just an injection to help me pass the placenta.
How long do you bleed for?
I bled a lot, for a long time. Probably about 6 weeks in total of heavy bleeding with clots. This is the thing i wish i had known about. I've always had horrendously heavy and painful periods anyway but i just wasn't expecting to bleed as much as i did after having my son. Maybe it's because it was such a quick labour? I don't know, but after delivering him i had to wear 3 or so maxipads and change every half an hour and i was still leaking blood on the floor whenever i got up or moved. Also, the clots are a bit shocking if you don't realise they can happen. I was regularly passing clots the size of golf balls and tangerines which seemed huge. I was advised as long as it doesn't hurt and they aren't bigger than an orange then not to worry - but i had to keep an eye on this. There was hardly any pain with this heavy bleedding and clots, don't get me wrong, it was just a shock as i didn't think i could lose that much blood and still be ok... but i was! Never felt faint, never needed any help, it just looked and felt like so much.
Can you pee properly?
It stung a heck of a lot but tricks like leaning forward and the squeezy bottle of tepid water (boiled and cooled works really well plus a few days down the line you could add some salt to it to act as a natural infection fighter!) really helps take away the sting and helps you heal up. I was more worried about the poo side of things as it felt like my stitches were going to burst the first time, but i think hospitals nowadays give you a stool softener to help with this if you've had a big tear. I didn't have anything like that and still managed it without bursting anything.