Just break out of the mentality that you are a terrible player and overcome the obstacle, if you use the disease as an excuse for your play then you won't push yourself to overcome that handicap life has dealt you. Might sound rough to say but if there is a will there is a way and if you just keep pushing you may find yourself capable of playing to a style that helps you.

One trick you could try, is if you have poor hand eye coordination, then practice playing blind, feel your tools and memorize the texture, if it helps put texture cues on your keyboard mouse, so that when you feel it, you know what you're touching and you aren't relying on hand eye coordination to do the work for you. Much like how the f and j key have dents you can feel to give use the cue that that's the starting position for typing. You could set something on your 1 button to know when your hand is on one, and by keeping your finger at 1 you'll know how to reach 2-3 because they are right next to each other.

Play around with ideas, it's something you can consider while crafting and gathering is how can you make it easier on yourself, how can you overcome the obstacle that's been a part of your life and ya, goodluck, hopefully maybe if this advice doesn't sound like nonsense it can help you come up with a means to play with more ease.