I hear you! You are getting better and YOU WILL IMPROVE! I assume you have seen a neurologist. This is important that we all get an assessment with whatever symptoms we have.
YOUR CREATIVITY MUST NOT SUFFER!!! GET BACK TO PAINTING. The different paints you use may cause a reaction, initially like sneezing, dry cough. So start with colored pencils. Use your sketching pencil and pad to draw. To start may I suggest just using color and let it flow freely--make abstract compositions. It is fun to do to get your brain re-attuned to your painting. This reattunement may take 2 or 3 months or as long as it takes----give the brain a chance to connect back to your creative self. YOU CAN DO THIS!! I HAVE FAITH IN YOU!!!