Hi there mummycaz, as
@chrishopkinsd suggests, make contact with your Doctor.
To be frank, I wouldn't suggest you tell him you are experiencing side effects of your new tablet, as that might deflect from anything else going on, and, or put their back up. The symptoms you suggest do appear on the list given for saxagliptin, but then they are pretty common for other things too.
https://www.nhs.uk/medicines/saxagliptin/
Good luck getting to the bottom of it.