Matt,
At the risk of sounding like your Mom, I'd still tell you to see doctor. I'll relate a story to you about a modeling acquaintance I have-- he's in his 50s, has been model building since he was 10, and used all type of paints lacquers and glues. a few years ago, he took up figure painting for commission. two years ago, he started losing the feeling in his fingertips, and like you, he took a break-- things got better, so he went back to work. A few weeks later, the same symptoms re-occurred, but he ignored them. One day, he woke up and couldn't feel his toes, had numbness in the lower extremities, and was very unstable when walking-- he said the worst problem though was controlling his bowels and bladder. After being rushed to the hospital, undergoing numerous tests, the Doc's ruled out exposure to modeling chemicals, however, he was sent to a neurological specialist who found that bulging disks from leaning his head forwards while painting had pinched his spinal column, likely caused by his work desk arrangement. He underwent an operation to remove several disks, and had a portion of his vertebra fused with rods. He's now back to modeling for commission now, but he works from an elevated stool, and his work surface is about 10" above the level of his belly button. Bottom line, your lack of feeling might be related to your neck too, not just chemicals. As a side note, if you are a veteran and spent any time wearing a steel pot (or Kevlar) you already have a head start on the neck issues. after hearing my friend's story, I've elevated my work bench and now use a stool. But I also use rubber gloves, and occasionally use a respirator when painting since I too use lacquer thinner for thinning and cleaning.
VR, Russ