What Causes Iron Deficiency Anemia ?

Question : Hi, I am a 41 year old AAF and have been diagnosed with iron deficiency anemia that has become progressively worse over the last 15 years. I do still have menstrual cycles but they are very irregular. I have been told that this is the cause of my anemia even though I have reported to my PCP that I have had XXXXXXX since before my teens and have always taken some form of iron as far as I can remember. My recent problem is the chest pain. In the last 2 years, I have experienced chest pain at least a couple times a month usually in the center of my chest but does not last for more than a couple of minutes. I have also experienced a lot of palpitations as well as a couple of episodes of SVT as high as 190s where I had to go to the ER but the doctor was able to get my HR down by instructing me to bear down. The ER told me to follow up with PCP but my PCP seems to think it is all to do with my anemia and not to worry about it as it should resolve when I have my hysterectomy this summer. I feel differently because I have had XXXXXXX all my adult life and never had any chest pains so I am concerned why I would be having these heart issues now. Should I get another opinion about this? I forgot to add that in Nov 2013 had Infed infusion and my PLT count went up to 2 million. I slowly came back down to 200,000 over the next 4 following infusion. I add this because I just received another infusion on 03-Jan-2014 and one on 17-Jan-2014. I do not know what my counts look like because I do not return for follow-up until 13-Feb-2014. My PCP told me it was a reaction to infusion of iron because my levels were so low I think he said my ferritin was 2. Anyway he started my on the aspirin then to help prevent a blood clot.