27 Yr old. Back upper molar pulled. No wisdom teeth so no tooth behind it. Cant afford impant. Depressed. Options? Chances of shifting/facial changes?

Not many options. Without abutments, you cannot secure a fixed prosthetic. And you're not going to wear a removable prosthetic for one missing posterior tooth. Your lower teeth might shift into the space over time. See if you can finance your care thru a healthcare finance company.
Shifting. Lower molar may over erupt causing alterations in the way your jaws come together. Talk to your Dentist about a payment plan. You can't afford not to do this. Not if, when, teeth shift it's more expensive to treat. Figure it this way, if you can afford expensive hardware and Internet access, you can afford health care.