The start of mastitis?

So I’ve been EBF for 3 months with no issues. Last night I started feeling a little bit of that tickle in my throat that you get before a cold. It’s lingering today (along with feeling just run down) and my right breast is really starting to hurt. I thought maybe it was just overfull, but nursing on that side didn’t help. My question, though, is whether the sore throat and icky feeling can be a part of mastitis, or am I more likely just getting a cold?