Also - if the end links are damaged - esp very rusty - you might (and I place the emphasis on the word: 'might') be eligible for a Honda program or 'campaign' fix, since there is a factory program that entitles certain Honda owners to a free replacement regardless of mileage - of the original wimpy rear sway bar links on all '98-'02 Accords 'cause they have been failing due to corrosion.
The replacement links are beefier, and only available in pairs. The originals were available individually, but all dealers were instructed to purge their inventory of the old design parts, and are not supposed to sell any of them anymore. Honda dealers also are to install them at n/c under the stipulations of this 'campaign'.
Although my local Honda dealer told me that the 'campaign' only applies to vehicles sold in the NorthEast (and if they've already failed), he's incorrect according to Honda. [my local dealer can be a real dick at times] Afterall, rust is rust. . . If you need the # of the campaign let me know.
In the meantime, try using 'PB Blaster', and spray it on everyday for a week, and hopefully the constant flexing might break the rust loose. Also, try and fit a piece of pipe over the straight end of an allen wrench, and use the longer length of the pipe as a lever. Wear gloves, too. Or, if you have the proper sized allen socket use it in a breaker bar or a long torque wrench. And, remember that you'll need to use a metrix-sized allen wrench or allen socket. . .