I have chronic shortness of breath?

I have chronic shortness of breath. I usually feel a tightness in the chest area at the same time, and I have to stop mid sentence to take a deep breath sometimes after every word or every second word. But then sometimes when I really try hard to relax it is better. I have had the condition for about four years and I can remember a few occasions when it was not there, so that I could have a normal conversation.
I have a history of anemia and iron deficiency, high cholesterol ( but not high enough to be needing medication ), and narrow veins ( at least in the arms, the nurses always take a few minutes to decide which arm to take the blood from ).
I’m 43 years old, female and of normal weight.

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