SO FRUSTRATED

I've posted about sleep before but I am still struggling...

My 7 week old typically sleeps well but recently has decided for the past few weeks to only give me one night of sleep and then wake up every 45 minutes during the night. I am so beyond frustrated and sleep deprived I actually find myself getting angry at him. I don't know what to do anymore. I've tried feeding him more frequently, I've tried putting him down earlier/later, I've tried having him take more/less daytime naps and NOTHING changes. I'm at the end of my rope here. Partly I just needed to vent but I'd also take any ideas or hints.