T.D.
I nursed my daughter until she was 2 1/2 and am currently nursing my 8 month old son. Have you tried contacting a lactation consultant or your local LLL to speak with someone to help with the latch problem? Have you looked into nipple shields? There are a lot of things you can try to help get the baby back to breast before you give up.
www.kellymom.com
http://www.llli.org/
A true lactation consultant DOES HAVE TO BE LICENSED. They have to go through schooling and do many hours of on the job training as well. If you are being offered services by someone and aren't happy with then find someone else!