Psychological Effects of Separation

Hey guys, I haven't been on in years, but this is the first place I go to when I have questions about my birds. As of recently my family and I have found ourselves in Mexico, we've been living here for about a year now and we are planning on going back to the United States soon. We've been researching, calling, and emailing every USDA type agency Mexico has in order to get the correct documents for our birds so we can safely return without our birdies being confiscated. We correctly and smoothly got into Mexico last year, but now we are facing a huge wall. To get our birds back into the United States we will have to pay a huge fee, quarantine them for a month in San Diego, and fly them on a cargo plane. The stress of this process is enough to give me a heart attack, I don't even want to think about the effects this will have on my feathery friends.
With all of that said we do have an alternative solution. We can leave our birds here, in Mexico, with a vet that we know and like and then return for them later. Later is defined by about two to five months. I just don't feel comfortable about leaving our four little friends in Mexico. Now I have to decide between two evils and I need help. My question is; what are the psychological effects of separation? I know they'll be really scared if we have to fly them and then quarantine them, but that's only for a month. What about two or five months of new, scary, strange, separation? They will be completely ripped from their normal routine, from their humans, from their family, and I'm scared it will end with a really bad result.
Please help, what are your opinions?