My fiance has basilar skull fracture and now i wonder what i am getting into. will this affect his ability to work?

Basilar skull fx: Most basilar skull fractures heal on their own without long-term adverse effects. The most significant part of the injury is the concussion to the back of the head, which usually resolves. In some cases there may be a loss of smell and/or vertigo, which can be permanent in a few people. In severe fractures, there may be leakage of spinal fluid which would need to be surgically repaired.

Mabye: He should get immediate attention in an er. The dr there can best judge what impact this will have on him [and your relationship].