If you got worse cause now u do spinners by pressing "x" or "z", then you can simply keep doing spinners by clicking them, as if you played with mouse only, like before (the way people grab the mouse is different if they don't need to click).
If you can't/don't want to click on spinners to complete them, then you will have to practice it again with your new play style (what AmaiHachimitsu said some posts before could be really helpful). I strongly recommend that you shouldn't try to get the same speed you had before right now. Do them slowly, I know you will be losing some score points there but if you gradually increase the speed over the days it will be easier for you to learn it again. The speed you're looking for will eventually come back.
Also trying different mouse grabbing methods could lead to interesting different results (with osu! in general, not only spinners), but this varies from one person to other so it's up to you to try it.
Good luck!~