Department of Consular Affairs, it's what my girl said to do go. I will go since I already have the appointment. However worst case I am in the same situation. I will stay in Bangkok my whole 60 days. I do not feel like going straight back to Vietnam.
Honestly depends on your plans. I live in $2-3k a month. But if you plan to party every night, get bar girls, fall for tourist traps, eat at rooftop bars every dinner…. maybe expect to spend more.