Ok.. well.. another option, which you can try, and has worked for me several times, but on teeth which are older than yours, is to stand in the shower and let water run over it, until the pain peaks.
you may hit a point where you don't black out, but you hit a threshold where the pain will start to subside, and eventually become tolerable.
stand there & take it, and it may help.
i only know this from experience.
another helpfull item is Dollar General amber mouthwash.. it's the best deal for the money, volume wise.. it has thymol, eucalyptus, etc.. same shit as listerine, 24% alch, and kills everything in your mouth.
rinse, spit, rinse spit, for however long it takes.. dollar stores have the same shit, but oz per oz not as cheap as dollar general...
if you need a filling, try & find an old time dentist.. a guy in his 70's or older, because those fuckers know how to do shit fast & cheap.. just fill him in & tell him how much you have & hand it to him, if he says yes.
sometimes tooth pain is not endemic to the tooth itself (if yer lucky), but has to do with the bacterial population of your mouth... ANY antiseptic, including 10% saline made from salt packets, or brushing with a salt paste will help manage it... high density saline, however (+10%) is caustic and you need to be carefull about brushing with it more than a few times a day... rinsing is fine, but don't abrade the gum by brushing with it a lot.
if you have an abscess or infection issues, you may want to consider anibiotics... far be it from me to suggest that you try the nasty tasting, powdered cattle antibiotics ("Duramycine 10", which is tetracycline hydrochloride) that agway or tractor supply sells at about $5 for 6.4 oz, mixed in water at a density of about 1 level tablespoon per 16 ounces of water (or fruit drink), 3 times a day, untill the inflammation subsides and 3 or 4 days afterwards, because that would be fucking illeagle..
other possibilities for sealing the tooth are acquiring glass ionomer cements and/or hybrid-composite primary dental material for about $20 each from ebay, but i think.. i only *think* you're supposed to be a dentist, but i've never been asked..
be carefull sealing any tooth without proper cleaning, because if you leave necrotic material below the dentin fill limits, the rot can continue..
also.. 'ceramic' (not porcelin) or hybrid type fillings do not last as long as true amalgams..but they can be very good long-term temporary solutions...
in any case, if you're in the DC area, or within driving distance of wherever the fuck i am, i'll help to whatever extent i can.
if it's really bad, you may be able to go to an emergency room, because the law is, as i understand it, that they *must* treat you, even if it's only supplying you with a handfull of real antibiotics..
does anyone know what the story is with free anti-biotics at wall green & cvs, when you hold a valid prescription for them?
anyways.. good luck..
& seriously, even if you think i am a troll, a creep or a lurker or whatever the fuck you have in your head that i am, i'm more than fucking happy to help you if you're within an hour or two's drive time.
just let me know.
peace, etc.,
john