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That's a really difficult situation you're in. Feeling afraid of seeing a parent end up alone is very common when your parents are divorced and your family is small and usually I'd suggest that you ask your parents for some kind of custody where you could spent alternating days or weeks at each other's house. However, since your mother lives in a different country that's not possible.
Have you tried talking to him about it? If not, you should (calmly) try. When he's sober and calm, tell him how you felt scared and worried and ask him to do something. He can seek therapy or professional help if he can afford it and if not look around your area for support groups that are free or cheap (make sure they're legit, by real foundations or health centres). You know him better than all of us do, however so only do this if you feel safe enough doing so.
Ultimately addicts are the only ones who can make the final decision to get better. If your dad is not an addict that decision should be even easier to make. Either way, if he refuses or doesn't put an effort into it, your safety and wellbeing should come first. Go to your mum's, tell your dad that he needs to get his life sorted out before you can move in with him again, and hopefully this will work as wake up call to get better - he may not, but there's a strong chance that if he knows you love him and want him to get better so you can live with him that this will motivate him. You can still visit him over holidays and things, and talk to him often. Of course this is only my opinion and it's a very difficult situation, so you should do what YOU think will work for you.
