Short answer is yes based upon the facts provided for VA disability compensation. Under normal circumstances, an ELS would be considered a characterization of service "under conditions other than dishonorable." There are a couple concerns I have based upon the facts provided: (1) you absolutely do not need to hire an attorney; and (2) if it has been several years since you received a decision from the VA your claim is considered "final" and you'll need to take some affirmative action to have your claim reviewed (most likely a request to reopen). Feel free to give me a call at 732-238-6070 or email at email@example.com. I'll be able to walk you through the process once I get some additional information.
This question is less about military law than it is about VA appeals. I advise you to find a VA attorney who can, and has, fought these sorts of battles with the VA. Seth Director is a frequent commentor on Avvo, and is well-regarded in the VA circles.