I am 40 years old. Have a 9.5 blood count very low in iron 17; have deficiency in vitamin d. I am on my first infusion feeling very sick.

Look for cause. Vitamin d deficiency is likely to be dietary. You need to find out why you are iron deficient. Are you perhaps losing blood from an ulcer or cancer of the GI tract or elsewhere? This may already have been addressed, but you need to find out from your physician what is happening to you. The iron infusions are not pleasant but will help you.