Day 3 of antibiotics for sinus infection still tons of facial pain headaches and lots of gum pain.. when will this end!? anxiety could it have spread?

I would give it: a couple more days. U can try Afrin (oxymetazoline) nose spray to relieve congestion/pressure but only use it for up to 3 days.

Sinusitis: Your symptoms are consistent with acute sinus infection and likely you have fluid and secretions causing the pressure and pain you feel. With antibitoic it is quite helpful to us a decongestant and also a nasal corticosteroid, to reduce inflammation and secretions. A mucolytic, e.g. Mucinex (guaifenesin) or similar, also helpful. Lots of fluids, too.