sore scalp & hair loss

Lizzie • PCOS, trying for #2
Just needed a little advice, I've booked a doctors appointment but it's not for 2 weeks!! 
For the past week or so I've had an extremely sore scalp. It's sore all the time especially when I brush my hair, I've not changed anything and I've been avoiding adding any hairspray, dry shampoo etc to my hair to see if this helps but it's still the same. 
I've got thick hair so it usually falls out when I brush it and in the shower but It's been coming out loads quicker, like a whole hair brush every day or so! I'm starting to see my scalp through my hair around my hairline 😩😩 
I don't know what's going on. Any advice  would be helpful, thank you xx