Sleep help

Hi ladies. My 6 month old has been giving me a run for my money. He had a cold about a month ago, then he got a tooth, I think hes working on the 2nd tooth. Prior to getting sick he would get up once a night. Now he is up like 4x a night and up for the day at 5am. He wants to comfort nurse all night. As soon as I pop him off he wakes right up. I'm going crazy. I have 2 other kids who are home for the summer now so there are no naps happening. I'm exhausted and desperate and ready to quit breastfeeding. Please help!