Hi.
Case I
It's difficult, I think it could be emotional dependence. For He has a sick relationship with his partner, submits and idealizes his partner and needs constant attachment and fear of separation.
I would send them both with the psychologist.

Case II
It can be a severe migraine, or a cerebrovascular accident or even a brain tumor. You should know from when you suffer and if it is temporary or permanent.
Among the studies I would do you are: an evaluation with the ophthalmologist, and a neurologist a tomography and brain magnetic resonance.

Case III
Although it is not understood very well, I think It is a left basal pneumonia, because it has cough, fever, decreased murmur in the left lung base.
It must be ruled out that this is an immunosuppressed patient, through hematological tests, chest X-ray.