For anyone that’s had iron infusions during your pregnancy - how was your experience?

I’m 31 weeks and due to my ferritin levels being at a whopping 8, my OB is having me get iron infusions. I’ll be getting 5 doses over the course of 10 days (I’ll be going every other day). I did get a chance to speak to someone at the infusion center when they called me yesterday to go over scheduling and I was able to ask some questions and definitely feel less nervous than I was, buttt I’m still definitely pretty nervous. My first appointment won’t be until the very end of this month, since apparently they’re completely booked out with patients this month. I’ve read online that some people have some pretty crazy side effects from the infusions. Has anyone here experienced that? I’m just anxious since this is the first time I’ve had to get any type of infusion and I’m also terrified of needles so that doesn’t help. I’d like to at least try to prepare myself a bit for what could happen!