celiac disease and low iron

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I have celiac disease and have been gluten free now for about 9 months.

I have been incredibly tired the last few months and went to have a blood test last week, I have the results this morning and i have low iron levels. my iron 11.6 (should be 9-26) and my ferratin is 22 (should be 10-120)

I just did a google search (as you do) and I have seen a common link between iron mal -absorption and celiac disease but my doctor didn't mention this and just said to take some iron tablets that you buy over the counter and I shouldn't worry.

My Husband thinks I should get iron injections but surely my doctor would have suggested this if i needed it?