Labetalol causing nipple vasospasm?

I have mild chronic hypertension that was diagnosed prior to my pregnancy. I was initially put on methyldopa which controlled my blood pressure and gave me no side effects. In my third trimester I began having occasional mild SVT to 136bpm. Because of this I was switched from methyldopa to labetalol and ever since I have had periodic nipple vasospasming. It can be pretty painful and my nipples turn white. At first I thought it was just another annoying symptom of pregnancy caused by hormones. After my LO was born this symptom continued especially about 5 minutes after having breastfed him. This on top of having a severely cracked nipple made the first few weeks of breastfeeding nearly intolerable. Warm compresses and wearing warmer clothing did not help. Searching on the internet, I could not find a good reason why this was continuing to happen once my LC and I had addressed my DS's latch issues. I only found 2 posts where people talked about this symptom associated with labetalol on the internet. At my 6 week follow-up appointment 2 days ago I asked my doctor to change my medicine back to methyldopa. The vasospasms have been much less painful and less frequent already. Has anyone else had this issue and are you on labetalol? Just wondering if I'm alone or not.