hey there hun welcome to 2nd trimester congrats getting this far.
I was getting bad headaches for a while there but i upped my water intake and seems to be keeping them away,i know what you mean about panadol as does not do much for me either i take three every 6 hours.
you could always ring up your doc or midwife see if anything stronger now you in 2nd trimester good luck hope you find something that works