I just need to know it gets better

My dog is almost a year and a half now. He's a toy poodle and is behind on training because of an injury that happened in the middle of his puppy hood that left him hurt for two and a half months. All he does is bite and bark and me. He doesn't do this with my roommate or family, at least to this extent. I've tried ignoring it, telling him no until he stops and then praising him when he stops, but nothing seems to work with him. We had a trainer who told us to make him bite himself but I've stopped doing that because that makes it worse and I suspect he sees it as play. The trainer also suggested stomping which again I stopped because now he bites feet. I don't understand what I'm doing wrong or why he seems to behave better for everyone else. Everyone who watches him rants and raves how good of a puppy he is, but he isn't with me. I'm still trying the training. I even do reverse time outs and leave him alone for 1-2 hours to be in my room but most time he cries at my door the whole time. I'm so tired, burnt out, and depressed. I just need to know that this is gonna get better. That he isn't some evil problem dog who hates me and that if I keep being consistent he'll train.