TB-
Unfortunately kids tend to have sleeping problems whenever they go through a new developmental stage (crawling, standing, walking, talking, teething (more pain than), big growth spurts, etc. If you're not already doing this, just be careful not to reinforce his waking up by being too soothing or fun. Sounds strange, I know, but it's important to just roll him over in a very matter-of-fact manner without holding him, talking to him, smiling, or even making eye contact if you can help it. He'll know someone cares enough to help him, but he won't have much of an incentive to cry if he doesn't actually need something if he knows that he won't get rewarded. As long as you keep interactions short and to the point, this is a stage he will grow out of. Also, his not napping will feed into his having a harder time sleeping at night. Sleep begets sleep, as they say. The idea that your child will be so tired that he will crash at night just isn't true. Our son started eliminating his nap at 11 months. We got a rec for a sleep expert from our pediatrician's office. The sleep expert fixed out problem in one phone call and didn't even charge us! We were soothing our son too much before nap time (rocking him, singing, etc.). She got us to just darken his room, read him one book, put him down, and tell him we loved him and would be home the whole time he was resting. You might want to look for a sleep expert if the naps don't return soon.
K.