Concerned about my health, need advice

I have an ulcer on my foot that won’t heal so my doctor is checking my A1C on Wednesday. I’ve also had lots of random sores on my other ankle/leg lately. Do you think it’s likely that I’m diabetic? I don’t feel good most of the time and struggle with bad fatigue, dizziness/tunnel vision, and chronic pain, but I also have fibromyalgia, dysautonomia, and endometriosis so I don’t know if there’s a new problem or just one of my old ones acting up.