What do you do with a parent who is on a fatalistic path with alcohol, diabetes, and he threatens suicide?

My dad is on a similar path, although he lives 8 hours away. We're trying to get him help with depression and I think that diabetes has affected his state of mind and is fueling depression/suicide though the confusion and pain and loss of former basic life skills. One thing we found that really had an impact was a life threatening viatmin deficiency. If you do get him to a doctor, perhaps asking for a full diagnostic or blood test for vitamins and overall health could assist in his recovery or treatment. Vitamin D can cause "cognitive impairment" and has been flagged as a major contributor to my father's current state of health.

Calling someone an alcohic is a pretty strong name unless u have something 2 back that up with especially since u all live diff. states, I assume u grew up with him in past yrs. but people can slow/stop drinking,pill popping is another situation that does'nt mix with alcohol,do u have any present knowledge of his use/abuse ?