Lost the notes on my iPhone?

One month ago, my phone was being wacky, very laggy, and eventually just turned off and wouldn't turn back, I managed to update my phone to the latest iOS update and that essentially fixed the problem, and it's been fine, but I lost my the notes on my phone! I have important health related notes on there that mean a lot to me. I last updated my phone in March, if I restore my phone with my latest backup from 6 months ago, will that be the only opportunity I have to getting my notes back?

Call your service provider. Are the notes uploaded to a cloud at all?