It's not clear from your post if you are complaining about termination from your job at the clinic or termination from treatment at the clinic. If it's the latter, that is not an employment issue and I have no suggestions. If it's the former, I am afraid your options are limited. Under the MA Personnel Records Act, you are entitled to a copy of your personnel file, including documentation that justifies the reason for your termination. You are also entitled to have the employer put your version of the facts in your file. As for the actual termination, I expect you are an at-will employee. This means you can be fired for a good reason or no reason at all, so long as it is not an illegal reason like discrimination. You say this might be influenced by your interracial dating relationship. But I expect the employer will say the reasons are due to the belief that you engaged in misconduct. This is not like a criminal case where you are entitled to a lawyer on your appeal to DPH. The employer does not have to prove the reasons for your termination beyond a reasonable doubt. Sounds like a tough case to challenge. This may not be what you want to hear, but at least you have some insight into how these cases work. Good luck.
This information should not be construed to be formal legal advice nor the formation of a lawyer/client relationship.