I Had Anemia Due To Iron Deficiency, However, I'm Taking

I had anemia due to iron deficiency, however, I'm taking iron supplements for that and my anemia has gotten better.
I've had plenty of tests on my heart, my heart is completely fine.
This is the problem:
My stomach is in constant bloating. My stomach is uncomfortable all the time. My body heats up (especially my shoulders) and my stomach feels bloated after eating, no matter what it is, and if i don't eat, my stomach feels full of gas and it's extremely painful. Eating or not eating is painful. I've been to so many doctors appointments and I don't know what to do.