Oh it's really hard making a decision for yourself which you know affects your child but there isn't anything wrong with saying you don't want to carry on feeding, it is your body afterall. Women encourage weaning for all kinds of reasons.
I know when I experienced the same pain (like needles describes it perfectly) it was the first time in ages I didn't enjoy feeding dd. I noticed every feed, rather than them just being a frequent part of our day.
Oh, I have just remembered this:
Hormonal changes
Are you ovulating or about to get your period? The hormonal changes at these times can cause sore nipples for a few days. Typically, both sides will be sore. Many moms of older babies are more bothered with latch on during these times, and it may feel as if baby is clamping down or scraping his teeth on the nipple, even though he doesn't seem to have changed his latch. Mom may also feel generally uncomfortable and even irritated with nursing. Some moms get relief from the soreness by taking evening primrose oil or a calcium/magnesium supplement.
From here and more
The recommended calcium supplement dosage is between 500 mg calcium/250 mg magnesium and 1500 mg calcium/750 mg magnesium (the higher dosage is generally more effective). Calcium dosages this high should not be taken alone, but as a calcium/magnesium (or calcium/magnesium/zinc) combination. Otherwise the calcium will not be adequately absorbed into your body. The amount of supplement depends on the composition of your diet -- the more animal protein, the more calcium/magnesium needed. If you are a vegetarian or vegan, the lower dosage may work fine for you.
Start the supplement when you ovulate, and continue through the first few days of your menstrual period. If periods are irregular, then begin calcium/magnesium at 14 days after the beginning of your last menstrual cycle, or simply take the supplement every day.
Here
I still have hopes to let DD self-wean so I have decided to try the supplements (EPO this month).
If you still want to wean it sounds like you're doing it sensitively with your DD in mind.