I use the Hyland's Teething Gel, which you can put on as often as you like. Works better for us than the Hyland's tablets (I think each kid reacts to one better than the other). We also do a lot of teething biscuits, a wet washcloth, and lots of extra cuddles. We also do Motrin at night when it is really bad, or he has a higher fever (which my son does get when teething). Although we go generic (cheaper), but would suggest you do the same if you haven't heard about the quality issues/recalls with Tylenol and Motrin.
Since you said he keeps getting worse every day, he might be having some problems with the gel you are using, or it might be something more than teething. My son has his up and down days, but it doesn't just keep getting worse and worse for a week, he always has some time in there where he isn't feeling so bad (teething at the beginning was quick for him, but after the first few teeth it always takes several weeks to a month for one or two teeth to come in).