Hey Mindolla, and
First off, I know that struggling with self esteem issues can sometimes make people come across as not-very-nice...my personal theory is that people with low self esteem often feel like they are being attacked from all sides, so they tend to strike pre-emptively at others so they won't get picked on. Sorry that you are struggling with this...just being aware of it can sometimes help to curb the behavior, if you want it to be curbed.
Congratulations on the original 120 lb loss, and stopping yourself before you gained it all back! You know what you need to do, because you've done it before, so get on it! Whatever sort of plan you're following, we probably have a forum for it, so look around.
Can't wait to hear more from you soon...keep posting!