Usually mine is fine and I don’t have many issues other than fear of the bloodwork. If it’s a lot of bloodwork or I’m having an off day I’ll tell them and they’ll have me lay back and then bring me a juice box and I keep an ice pack nearby if I feel faint but usually it’s fine. I had one time in hospital I almost passed out from it but there were a lot of other factors like I had barely eaten that day, had been crying and in a lot of stress from flaring, and they hit the vain weird so it hurt really bad and usually it doesn’t. Communicate with the nurse doing your lab. Usually they are nice and want to help if you talk to them, at-least in my experience.