What Causes Buzzing Sensation In Ears Followed By Severe Headache?

Hi, I have had a sore pallet L. Side for five days, also had a strange buzzing in my L ear two days ago, last week suffered terrible headaches but they have eased. I am experiencing awful night sweats but 4 months post partum and still breast feeding . I had root canal treatment the beginning of December which went well with no problems after .