Don't try benzos, and don't see how you're going to react to them. The damage won't heal with time because there is no damage. You don't want to re-sensitize the serotonin receptors, the reason why you no longer get euphoria from alcohol is because your serotonin levels right now are higher then before taking the medication, so you still have high serotonin. It's in fact the serotonin that's saying "no" to the euphoria. Don't take serotonin antagonists, they are not very efficient, no proof that they work.
The question is, if you were happy drinking alcohol back then, why did you start taking an SSRI? Were you depressed after the alcohol euphoria? Was the euphoria worth the depression that followed it? You see what I mean? I completely understand your frustration, although remember that it is serotonin that is saying no to you, and not the lack of serotonin, but ya, I relate to that. I can give you an example:
When I was performing "extra-curriculum activities" in University, on amphetamines, holding my penis of course, when my serotonin was low, the pleasure I was feeling could go into realms...lets just say that every time I was reaching a pleasure peak (before even edging because I was nowhere close to cumming) the pleasure was so intense my heart was skipping beats, and sometimes would stop to the point where I would black out, so I had to let go of my penis for my heart to keep pumping, so I could go on with it and not pass out. So the thing was so intense, the spinal column had trouble sending in information from the brain to the heart and back, because it was overwhelmed with that signal. I never tried Heroin, so I have no idea what that would do, but I know for a fact it cannot do anything more than that, I could clearly feel that that was it, it couldn't get any better.
Then comes Mr. Serotonin, out of nowhere, 5 hours later. Every single time, on every binge. The euphoria starts to fade away, 2 hours later, all I feel is an electric buzzing and zero euphoria. Typical serotonin symptoms, I could sense it was increasing, it couldn't have been anything else. It's like my connection to nucleus accumbens was...poisoned by serotonin. It doesn't diminish the electrical signal because I was still sensitive as fuck, it just alters its nature and you lose the connection.
My reckless method of dealing with that was to induce a weak serotonin syndrome by taking serotonin agents, to provoke a selective tolerance to serotonin, then I would give a 2 weeks for the serotonin to empty up, this usually caused migraines, but for what I was getting it was worth it. Don't ever try this at home, if you don't know what you're doing it can end very badly for you. But ya, it is your serotonin that's saying no to that weak dopamine rush that alcohol used to give you, your accumbens connection is poisoned. Your only option is to either clear out your serotonin, risking depression/migraines, or use a stronger dopamine agent then alcohol.