I have been exclusively pumping for my twins for 4 months now and it's been going well but today out of the blue my left breast is killing me! The nipple hurts and when anything touches my breast it just throbs, deep inside. I have no fever so I don't think it's mastitis. I am pumping every 3 hours and I have noticed that my production is also down, used to be able to get 10-15 ounces and am just barely scraping 9 out now. Any ideas?? I really appreciate any thoughts on this! Thanks!