What do I do if my part-time master's program is changed to full-time?
1) I have no answer for this one.

2) Pretty much the same way you explained it to us. Your seem to have legitimate reasons for lower grades and/or dropping out. If you decide to apply for graduate programs abroad make sure to explain this in your statement of purpose. Take your time to word it perfectly. It can make all the difference. The fact that you committed to a six year graduate program while working a full-time job shows passion and dedication. You want to make sure that comes through in your statement.