Anger & non-communication. We need help.

My husband reacts with disproportionate anger and irritation in almost all things in daily life. He doesn't spend time with his son or wife at all, instead chooses to spend time on the net. Displays road rage when driving. Is non communicative. Reacts with anger or indifference if I try to talk to him. This has been happening with increased intensity for the past couple of months. But most of these behavior has been there for past many years now. He is 44 years old. I am 38. We have been married for 13 years. We have a 5 year old son. Both of us work. I am the primary breadwinner. my husband has never shown much inclination to assume responsibilities for providing financial security for family. He is also not invested in providing emotional support. I fear that he is suffering from depression or a personality disorder and seek to understand what's troubling him. Our son who is 5 would like to spend more time with him. We need help.