Medication 🙄

Libby • Pregnant with my 1st!!😍❤️
Im changing over to my next medication (3rd one I'll be trying) and so I'm taking half of my current medication and I'm having the worst anxiety, 
My mum just went away for 4 days for work so I'm watching my 2 littlest brothers on my own (I'm 17) 
Should I take a full tablet of my current medication and change when my mother gets back or should I just continue and change taking half a pill and have hectic anxiety?