I'm struggling and trying to find the right combination and strength

Sorry to hear this, @LisaJHM.   Are you able to contact your Onc or GP and discuss your side effects?  Sometimes what works for some doesn't work for others.  It is important that they know about how ill it is making you

Take care, and I hope you can get on top of this asap  xxxx    Can you try taking your tabs at a different time of day?  At night instead of morning or the opposite?

Thinking of you & big hugs xxx