I thought puking was over!!

When I got off work today I went swimming and eventually laid down for a nap. I napped for maybe 2 hours and woke up feeling so sweaty and shakey and pukey. I eventually threw up. But after I threw up I was so much better. So weird because I never had any morning sickness and I'm 6 months along. Has anyone else had any weird episodes? I really thought it was about to be something serious that lasted a while but now I'm fine.