I was told I have aneimia on the phone? What does that mean?

I have to see the doctor about it soon as they just told me this on the phone. They’re gonna give me a prescription as well. What does it mean? Anymore info before the appointment will be great. I’m a bit impatient. Basically what it was is that I went to see a doctor about my stomach, it turned out I’ve had fecal impaction, constipation. And they gave me blood tests and found I have anaemic. Sorry about the spelling.
I’ve haven’t suddenly decided to go vegetarian, I’ve always been one. It is probably the case that I’m eating all the wrong foods. I can’t eat meat because my body just won’t take it. I’m not even gonna try.
I’m 24 btw.
I went to the doctors although I didn’t get to see my dr I got a prescription. It was a folic acid deficiency.