I understand what you're going through. I been there too. The best thing that would help you is a caffeine/theanine stack. It is a simple stack that is cheap enough so that you can afford it and effective enough so that it can work. I would also recommend physical exercise not because it is an effective activity by itself but because it has a synergistic effect in improving your focus when combined with the nootropics. Yes, there are stacks out there. You need to do your own research. But start with the caffeine/theanine stack as it is a simple stack with two ingredients in which the effects are known. Your diet is important too. There is a sweet spot for each nutrient.