A one off reading could mean anything John. As Netty says, 6.3 is fine. You could have been dizzy due to heat or a 100 other things. If it becomes a regular occurrence, dig deeper. Hope you feel better soon.
Mo
Are you readings userly higher? When i was first diagnosed my readings were up at 15-17 and as i got more control and tbey lowered i would get shakey and feel like i was having a hypo when my sugarz were around 6. My doctor at the time told me to take an energy tablet or 2 to help it and it usely worked for me just 1 would help ease it but everyones different and its true could ve anything i hope ive helped :grin:
Few weeks ago I was in the 20s when I got diagnosed but after a month or so of meds a range between 4.5-7.0 but every now and then I feel really shaky dunno if it's the weather or my body getting used to normal sugar any ideas