4 week old won’t sleep

My 4 week old has been waking up the past 2 weeks around the same

time. He stays up from at least 12:00am-6am. In between that time frame. I have changed him, burped him, patted his back, gave him his pacifier, he constantly breastfeeds on me at least every 45 minutes, falls asleep & when I go to lay him down, he wakes up and cry. My boyfriend isn’t much help. He gets more sleep than I do and only helps when he hear the baby crying. I am very frustrated and very exhausted. I barely get any sleep maybe 4-5 hours out of a 24 hr period (interrupted) I have 2 other children to tend to through out the day 6yr old & 3yr old. I don’t know what to do anymore. I want to cry I feel hopeless and I’m very close to giving up breastfeeding which could be the problem. He’s usually very fussy I assume because he’s gassy. My boobs feel like fire from him being on me so much and the lasinolh cream isn’t helping much. ☹️