Advice?

I only come seeking advice because I have no one to talk to about this,

I’m 23 years old I have a 3 year old and a 2 year old with my “husband” we used to live together at my mothers house but he’s been gone since December. But we stayed somewhat together...In about March he sent me and my kids to live with his mother in Mexico (currently where we are right now)

For Mother’s Day I went to my grandmas house and my daughter got sick so I stayed a few more days over there but he’s been constantly telling me that’s he’s going to take mommy kids away, every time I don’t listen to what he says. I’m tired of it . When my daughter was sick he didn’t offer to send me any money I had to ask my cousin to lend me money because of it and he acussed me of being a whore and selling myself for money and I called it quits , I couldn’t deal with someone like that anymore. So I blocked him but still kept in touch with his mom to tell her how my daughter was doing , I ended up coming to his mothers house because I’m afraid he’s going to take them from me and I can’t have that happen so i only did it to calm him down. But I don’t even feel wanted here anymore , I obviously know she’s going to be on his side and it sucks i really just wanna go back to my grandmas but due to his accusations I can’t , nor can I go back to my mothers because it’s just to damn toxic there as well . I don’t know what to do . 😔 I’m just tired of everything that’s going on I can’t be happy I’m so stressed I’m not happy here my hair is falling out I’m crying all the time , but I don’t want my kids to be taken from me....