Can anyone shed some light on a way to get relief?

I am 12 weeks 2 days, and since around 10 weeks I've been struggling daily with headaches, pain in my face and stuffiness. I've tried almost everything. Panadol, and Panadeine have done little for me.

I've tried vicks vaporub, and vicks vaposteam in a bucket of hot water. I've got saline spray (which does nothing) and I've tried hot compresses, and hot showers.

I've seen my GP, ended up in emergency for an afternoon last weekend with a massive migraine and gone to another GP (because mine is expensive and with all my time off work I'm short of money).

I'm at my wits end. Had to go home sick good friday and took yesterday off too. On the outside it probably looks like i'm faking it, but i can tell you i wouldn't miss out on public holiday pay if i wasn't feeling like this, i feel awful.

I am exhausted and I am miserable. I am all out of sick leave and worried about my job security.

What more can I do? The GP prescribed me amoxicillin, but i'm allergic to penicillin, so i'm too scared to try it in case i do react.