I've had blood sugar issues for decades - the first time I had a hypoglycemic attack I was (I think) 16. I'm fairly sure this was down to my liking sweet things far too much, and consequently stuffing myself with them at every opportunity. Basically, whenever I eat something sweet my blood sugar spikes for about half an hour, and then crashes, leaving me shaky, sweaty, with my head spinning, and generally feeling pretty rubbish and incoherent. Oh, or just plain grumpy. My reading (with some help from Julie) led me to think this was probably Reactive Hypoglycemia.
The solution for which is to "stop eating the bloody sweet stuff that makes you feel shit". And so I don't. Mostly. Except when I have all the self-control of a rat on crack, for instance when I'm stressed, which I am too much of the time at the moment *sigh*.
Also, both stress and weight feed into this - when I'm less stressed it affects me less. When I'm thinner it affects me less. As I'm currently overweight and stressed, things could be better. But I am working on this.
A more recent issue is gluten related. I've been having an issue for about a year where eating bread made me "gassy", with pasta causing a similar (but lesser) effect. And this has been getting progressively worse, to the point where eating a couple of pieces of toast would cause my stomach to swell up and then do awful things which I shall not inflict on you*.
And so I went in and told the doctor, and he said "Yes, that sounds like reactive hypoglycemia. Don't eat sweet things. And that's gluten intolerance alright. If you're willing to eat gluten for 6 weeks then I can do a test at the end of it for coeliac. Which we would treat by telling you not to eat gluten." To which my response was "I am not putting up with 6 weeks of pain and awful noises* in order to be told not to eat something I'm currently not eating."
And he sympathised with me on both counts, and sent me on my way.
Glad I went in though. I'd have felt really stupid if there was something useful they could do and I hadn't checked. Or if I'd completely misdiagnosed myself. It's always nice to have doctors tell you that you're right :->
*Feel free to imagine in your own time.
Original post on Dreamwidth - there are comments there.