Bright, Depression is the main ingredient in MLC. As for the AD medication, he may get it and not take it or he'll take it and discover that he's not quite himself, i.e., possible side effects, and go off of the meds. If he is taking ADs, he needs to see his physician periodically to ensure that he's taking the right dosage...I wonder how he's managing that while being on the road. Time will tell on this one.
I don't see him entering another stage of the crisis just yet. If he's in the very deep, dark depression/withdrawal, he wouldn't be reaching out to your son just yet. My friend was still in the replay stage when he got ADs, tried them and then stopped taking them. In fact, he would open the bottle, smell the pills and then recap the bottle and put them back on the shelf in the cabinet. He said that the dulled his senses and interfered w/his sexual performance.
Life hasn't been a picnic for him, even though he has been posting to FB. It's a very painful, emotional journey for them and it's not something that is fun for them. If he is actually taking meds, he shouldn't be mixing them w/alcohol. But that is for him to figure out.
Bright, please try to refrain from looking at his and the ow's FB pages. I realize that you are curious, but you've got to let it go. Looking at FB tends to discourage and frustrate you and it keeps you stuck for a bit. Whatever happened between them is now yesterday's news and who knows, tomorrow they could be best buds again, which happens quite often. He could very well have a new ow by next week. Again, time will tell on this one.
Your son will be able to tell how he's doing when he sees him. Although he may very well put on the happy mask, he'll not be able to keep it on for a very long period of time because it's too difficult and a lot of work to keep up the happy go lucky attitude.
Keep your expectations at zero. You can always have hope, but I don't see where he's actually gone into the dark depression w/withdrawal from everything and everyone. He's still got a ways to go and that could take a while. Until then...continue to focus on you and your life. If he wakes up and wants to reconcile, he will have a lot of hard work to do and by that time...well...you ultimately will be the one to make the decision as to whether you want to try or not.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.