this is a bit

because i dont even know how to explain this in english.... or in any other lenguage, so here it goes
2 days ago i woke up, and when i moved i felt something different, my nipples were hard, alot more than normal, and when my left nipple touched the blanket, it was kind of painful, but they are pretty sensitive so i didint pay much atention to it, but then it happened again and it was only my left nipple, and thats when i noticed this tiny thing at the tip of my nipple, looked very very swollen (a gland? sorry i dont know the name) it's tiny, but compared to the rest of the skin of the nipple looks like it cant get more swollen than it already is
it hasnt changed at all, i tried using ice to see if it helped coz i have a dr apointment tuesday morning, but the nipple getting hard seems to make it worse, and it's like that most of the time coz of the slight pain
does anyone has an idea of what could be? i'm still going to the doctor, but im a bit worried, and well, clueless