I lost a friend to meth and GHB at the beginning of this year, and although details are different, the trajectory is similar. He suffered anxiety and was fearful about his life for years. Meth was what gave him fleeting confidence and euphoria, but also what finished that life. He was terrified to live, and he was terrified of death, so he self-medicated to manage, and ultimately that killed him. As one of the people…
It took me a long time to learn this: there are problems for which there is no answer.
I got this from Buddhism (I have renounced Buddhism, but I've retained some of the insights). The world is intrinsically fucked-up, and not fixable. You can sometimes fix some things, but in the end the world is an incorrigible mess (samsara).
It's quite a relief once you take that on board. You can go on raging against injustice, war, and political cynicism, and so you should; but there's no need to feel inadequate because you don't know how to fix it.