Wifi: no hardware installed, then flashing question mark when restarting
Assuming no major external force (drops) or liquid damage to the computer. 

IT sounds like your hard drive is not "happy" and at the very least you might your hard drive directory repair beyond what Apple's built in tools disk utility / FSCK can perform. 

Disk warrior is an excellent option for hard drive directory repair when the built in tools are not sufficient. 

To be quite honest it sounds like your hard drive is failing. One unlikely scenario (still possible) is your hard drive SATA cable, optical drive etc.. one another part is bad making look like a hard drive issue. 

I would have a tech take a look at your computer before you tinker with it too much, sounds like waiting until you return is your best option.