please- ask your doctor about
iron infusions. they are what i did when i became aenemic like 4 times this year.
they do it thru an IV. takes about 6 hours, but your good to go for a long time.
as for iron pill/supplements... they actually excerbate symptoms of colitis and are hard on the lining of the colon. i was told that taking iron pills with active UC is bad. and i agree, i took them before i knew any of this and during that time i had it pretty rough.
symptoms were definitely worse.