Well, yes. I went undiagnosed for a long, long time, and with a high A1C of 10.5%. One of the really bad symptoms I had… about 8 months before my diagnosis (and I am sure I was quite high at the time, looking back on it)… was a very, very horrible abscess (a major boil under the layers of skin) just below my right buttock. I didn’t even notice it, right away, until it got to like the size of a football, and I couldn’t walk! I had to go to the ER, and have it cut open, and drained. It was… by far… the MOST painful thing I have ever endured. Ever. They had to give me a LOT of morphine, antibiotics that I had to eat a boatload with, or they would make me puke, and hydrocodone. I had to stay, laid up on a towel… for about a week… 
Worst. Experience. Ever.
