It's been over a year since my surgery, so I can't remember what the exact Morphine dose was, but I'm sure someone on here will know. It made me sleepy, too. Are you also having your colon removed? They will have blood ready to give you if they feel you need it before or during surgery. They just give it to you as an I.V. drip, so it's not a big deal.
My hemoglobin has gone down to a 6 before, and I was almost fainting from the lack of oxygen flowing through my blood. I would get winded just walking a few steps. So, I've had to have several transfusions over the years, but have never had any problems from it. In fact, it made me feel a whole lot better. I know they test for hepatitis and HIV before giving it, so please don't worry about that. A hemoglobin of 4 is very low. I'm surprised you don't feel tired when it's that low.
A stoma can take up to two weeks to start working, and they will not discharge you until it puts out, so it's good to be prepared for that. Everybody is different. Mine took 10 days to work. Getting up and walking is supposed to help wake things up. I walked a lot, but it still took a long time to start working.
I honestly wasn't in much pain from the actual ileostomy surgery. One thing that hurt for me was trapped gas pain. I would advise bringing your own chewable Gas-X tablets, so you don't have to wait for the nurse to call the doctor to have it approved and then sent down to the pharmacy, etc., etc., before receiving some. That's what happened to me, and it took several hours before I received a couple of over-the-counter Gas-X pills.
The other thing that really hurt was changing my wafer for the first time... the adhesive pulled out all of the little blonde hairs on my belly one by one! That really hurt! So, I advise shaving the area on your tummy where the wafer is going to be, so you don't have to pull those little hairs out the first time you change your wafer.
I hope I've answered all of your questions. Please know that this surgery is going to make you feel sooooo much better! I know it's hard to believe now, but I promise you, it will.
Dx'd Crohn's in '99 at 28. Proctocolectomy & ileostomy in '06.
Pain-free, med-free, and very thankful to be healthy again :)