Hi Shropshirelass, when I was diagnosed with TGN the dentist (an experienced one) had done all necessary treatment, X-rays etc that she possibly could then referred me to the GP who correctly diagnosed the TGN. (GP did say prescribing correct drug could be tricky and take an exact note of name+dosage of meds I tried. Luckily first drug was ok but it took a month to find the correct dosage. Twice while on holiday (yeas ago!) I hadn't packed enough so for last 4 days I rationed myself to 2 daily instead of 3 - by the time I got home my mouth was throbbing and I won't ever do that again!)
When I thought I had TGN on other side of my mouth, I phoned (new) GP (Lockdown rules by now hence phone call), told him and within 2 sentences he said to go to dentist as it sounds like a tooth decay problem. Dentist diagnosed infection on phone,2 lots of anti bs and no more pain (no further treatment required! Hurray!!)
This will get sorted Shropshirelass, hope it's soon xx