Breastfeeding issue

Hi I have a lump at my breast area and it seems to go until near my armpit area. I went to KKH but they said they don't have a doctor available to check my breast for the lumps and they told me to go SGH instead. I'm in alot of pain so may I ask for any advice if anyone knows where I can go to check for this? Walk-in Clinics also can... TYIA! 🙏