How to get hospitalisation leave

Dear mummies, I've been battling with terrible body aches and have maxed up my mcs and leaves. But whenever I go to my gynae they would say they are unable to give me HL. I'm currently on my third trimester working in healthcare and sadly, I have to move around a lot which is tiring and painful for me. Any tips on how to get HL? Thank you mummies!❤️