higher combined physics advice GCSE

hiya, i'm taking higher combined science however my main concern that could damage my grade is the physics portion because I take foundation maths and I have a hard time with the maths in physics.
Do I have to take foundation combined science if i feel like i can't do the higher physics??? However i am interested in STEM careers, it's just maths that I struggle with.
I didn't take triple because even if the grades are seperated meaning i wouldn't worry so much and more bio and chem would be nice but more physics would make my brain literally combust.
What can I do????