You say doctor -- is the doctor a psychiatrist or a regular doc? Psychiatrists are much better at this than your regular doc. They do have to report suicidal urges if they think the person is in a state to actually try it -- lots of people say they want to die but really don't. Psychiatrists deal with this as a specialty; regular docs don't. He also needs a psychologist to do talk therapy with, because while the right drugs eventually might treat the symptoms, they don't cure the problem. It would also give him someone at a distance to talk to. But nobody can help a person who doesn't want help -- you have to want to work very hard to get better for anything, including medication, to work. You have to take it when it's prescribed and how it's prescribed. You have to tell your psychiatrist when something isn't working so they can taper you off properly and try something else. It is true that if you see any kind of doctor, whether a general one or a psychiatrist, all they will do is give drugs. If you want something else, you get therapy. Most psychiatrists don't do that anymore, they just prescribe drugs, and psychologists are less expensive for the same service if he's willing to talk to someone about this who might be able to reach him. When you say his Dad isn't helping, do you mean they're not in contact, or he doesn't care, or he's given up trying, which happens?
If your son is threatening suicide, you can call the police or 911 for an ambulance and he will be involuntarily committed for observation. A psychiatrist will then assess his risk to himself or others. Please also check your email and inbox associated with this account for resources. We wish you and your son the best.