Help!!! My husband wants a divorce and custody!!!

UPDATE:

So I talked to him about counseling at least for our son’s sake and he agreed to that. I am however still going to prepare myself just Incase and still seek out a lawyer to know my options if it does result in a divorce. I want to thank all of you for your advice and words of wisdom! I honestly appreciate it so much and all of it has been helpful for me mentally. Also very helpful for a look into what actions I should take.

So my husband wants a divorce. A little back story. We’ve been together for 15 years , 11 of those married. We just had our first baby in December. I got postpartum depression and anxiety which has strained our marriage. That mixed with COVID gave me extreme anxiety. So yesterday he said he had enough of my shit and wanted a divorce. Then this morning he hit me with he wants to take the baby and I leave and go back home in Canada. I told him I will never leave my son. I told him we can try and work out a living situation because I am a stay at home mom now. I worked for years and supported the two of us many times. Now that I am at home he is trying to throw that in my face that I can’t support myself or my son so it’s in his favor that he would get custody. I have never hated him before but that just made me hate him. He doesn’t do anything for our son physically. He does work and supports us but he doesn’t feed him, change his diapers, wash the bottles, know anything of his feeding schedules or sleeping schedules. I do it all (no complaints whatsoever because I love every second of it). I just am lost and don’t know what to do. I want to go back to Canada because I have my entire support system there that would help my son and I. I would never keep my husband from seeing him, we could arrange something. I just don’t know where to go from here because I know I won’t be able to leave without his consent. Maybe some advice? I have been looking up lawyers.