Hi
I also get iron infusions due to chronic anemia.
I have had similar reactions, so I take 25 mg Benadryl and 650 mg of Tylenol and it helps. We run it slow and break it down into 8 sessions, over 8 weeks, which helps me absorb it better. When my body gets too much iron, it gets sluggish. It does sound like you had a reaction. Fortunately there are several different brands your doctor can order.
Also, I take Ferrous “Gluconate” VS Ferrous Sulfate… my body handles it much better, less ‘intestinal’ issues. Recently my drs suggested taking it every other day, which is even better.
Good luck to you!