I'd like to join TonyWK in welcoming oyu here. You are in a worrying and puzzling situation with no clear road-map of what to do. So coming here was a pretty good idea. This problem happens a fair bit, though the distance in your case does make things a little harder.
It's unfortunate your BF decided to stop his meds 5 months ago. Mind you he is not alone, an awful lot of people start to feel good, and think the need for medication is over -sadly not the case.
I guess the single most important thing you can do for him is get him back under medical treatment. Obviously the strain of job-loss had set him back a lot, and the alcohol is not helping either.
If you are not able to talk him into going is there someone else who might be able to persuade him -a family member or friend perhaps?
As for what to say, you can ask him, he may have some idea (I did not) or try to find things you both enjoy. For me the most important thing was I believed my partner was going to remain there for me, no matter how long it took, and that gave me a security I needed.
The best thing is listening - and not trying to 'fix' it all, no matter how big the temptation. To do so does create pressure
As Tony says he may need you more than you imagine.
Now, we have talked about your BF, but what about you? All the constant worry, frustration and uncertainty can leave you pretty wrung out. Do you have family or friends to support you at the moment? It makes a big difference not to try to keep on going in isolation. All sorts of negative thoughts crowd in when alone.