When S begins college, he'll have to adjust to more change than the average college student. Advice

Here are the changes he'll experience in list form ... just to be as succinct as possible: 1. Returning to the US from living abroad in Asia for 5 years (ages 14-19) with only 3 visits to The States ... re-entry shock 2. Separating from me, a single mom ... he's an only child ... separation anxiety 3. After college orientation, I'll be returning to Asia for work ... no visits home possible 4. I probably, due to distance and finances, won't be able to visit him till winter break of his sophomore year ... or to see him 5. The extended family is generally not very supportive, with one exception ... don't want to take advantage too much 6. Transition from an IB school with very supportive staff to a college where he's expected to advocate for himself 7. Must manage his own medication and advocate for accommodations for LDs ... he's leaned on HS and me for this 8. He's a smart introverted kid with a small circle of dear friends here which took him a long long time to cultivate ... 9. There just isn't much money to travel ... redundant but important My main concern is how he'll cope with the re-entry shock and that he won't be able to visit home regularly. On the positive side: 1. The college is a LAC with a student centered reputation and his top choice. Accepted ED. I think he used good judgement. 2. 3 of his closest friends are attending schools in the US in the NE. He'll be in Ohio. Given his global perspective, that doesn't seem so far away. They already Skype a lot ... live in the same city. Don't kids visit anymore? 3. Video Skype is free. 4. My sister-in-law is a understanding and supportive, but she's very busy, travels a lot for work. 5. What else is positive? Does anyone have any suggestions? Perhaps it's just me worrying and he'll be just fine. He is inclined to be practical, down-to-earth in his approach to life ... generally. But also quite sensitive, but emotionally reserved. Any thoughts?