What Causes Double Vision?

Hi, I m a 63 year old male, relatively healthy until 8 months ago. I don t believe those problems are related to my eyes issue, but they are ongoing and include: bloating after eating, poor digestion, constipation, very unstable thoracic area of the spine, with ongoing inflammation/pain, pain radiating around my rib cage, with severe ongoing pain in the sternum area, assumed to be costochondritis. However my NEW issue, is that when driving to work this morning, I was seeing double the entire 20 minute drive. No pain or dizziness. I worked all day and seemed fine while wearing my glasses (I use just for reading), but when i take them off, everything appears out of sinc . I just took a short drive 8 hrs later, and the double vision is still present! I am 6 ft tall, about $230 lbs, need to lose a few lbs., not overly active, eat reasonably healthy. I am not diabetic, and have moderately above average blood pressure. I see my doctors often with all the above other issues. thanks, Brian