Im afraid the bruising ect is normal, Ive had my arm butchered several times, some nurses are good some are a bit heavy handed.
you need to toughen up a bit because pregnancy is full of blood tests, relax about them, they are important to monitor your condition.
the dead arm and pain sounds like anxiety problems, you may not believe me but its highly likely given your slight overreaction to the blood test process, after a while you will get used to blood tests.
no they are not nice but they are necessary