getting pregnant with bulimia

Hi I was wondering if someone could offer me any advice.  I am 25 years old and happily married.  Since I was 15 I have suffered from bulimia.  My periods have been very irregular since I was 15 and began to have eating issues.  I conceived my son who is now 18 months old and healthy when I was 23 when not even trying.  I missed taking by birth control pill for 4 days by mistake.  I thought at the time that I couldn't even become pregnant because I went over two years without even having a period because of my eating disorder.  So now I am trying to conceive again with no luck.  I have been trying for 7 months.  I am 5 foot 2 and weigh about 105 lbs.  I again , am not having a period as i have not been taking birht control pills to induce menstration.  Does anyone have any experience with this??  Could I have ruined my chances of getting pregnant forever becasue of myeating disorder??