Oversupply

My two week old gained 19 oz in the 10 days since her last appointment. She’s also been getting fussier and fussier with reflux symptoms. I have a fast letdown and she’s often spluttering and coughing on the breast. My pediatrician said I could try nursing just one side at a time for longer instead of offering both breasts but I don’t want to decrease my supply by too much and have an uphill battle going back to work. Anyone dealt with this and fed one side only?