getting pregnant

I have thrown away a child in my teenage years because my parents didn't allow it.Since then I have gotten problems with my heart when I am running I get short breath.Sometimes I need to drink energy boosters to calm down my heart rate.I have been emotionally disturbed since then.I have been trying to conceive with my husband for the past four months and I have no success. I am scared I may not be able to conceive any more? Can anyone help me understand this?