I buy sugar-free candy and can eat them in moderation.
I also use Truvia (made with stevia, which is all natural) as well as plain old stevia, depending on what I'm sweetening. Sometimes I use agave syrup as well, which is natural and lower on the glycemic index. Real sugar is a super-bad trigger for me, so finding other ways to sweeten my foods has been a big help, and sometimes I find I'm ok with some things just being plain, like tea. One thing I do avoid though is aspartame (found in most diet drinks) as it gives me really bad migraines, but it doesn't seem to affect everyone. Also, it's worth noting that some sweeteners, like malitol, may cause gastric issues when consumed in large amounts.