Bed bugs help flipping out?

do they bite nightly? i can't find any signs of them, but i have bite marks and theyve swollen to huge proportions. i don't know what this is. its only two bites. buts its 66 degrees it cant be mosquitos and mine have neer swollent to the proportion before. i had a few bites tered around nearly 2 weeks ago.. but since then nothing, what can this be?! are they bed bug bites? what do i do?!