Your employer needs to sort it out. There are agencies you can go though for domestic employees. But i am not sure how that works. There is a facebook group for Phillipinos in Thailand and probably better searching for that as more likely you will find someone who knows what to do.
Its not a bad drive i like going via Ranong via the isthmus of Kra. But if you are not used to Thai driving i wouldnt recomend it, totally different. I was just in the States and i only drove twice didnt like it 555.