Is there a way a friend or relative could take you to therapy (once you were to establish a therapist to see)? Even if you had to give them money for gas; it's better than nothing. It's not right that you need "permission" from ANYONE to get the help you need!
Or sit down with your boyfriend and explain to him what you just explained here? FWIW, my dh doesn't "get it" either. His family doesn't talk about mental illness either; like it's taboo or something. But even though he doesn't fully get it, he knows that to me, in MY world, it's important. So that's the part that is important to him, kwim? Would your bf be more understanding if you explained it that way?