Thanks for all of the good advice. I haven't visited the shop yet - I know I have to get down there but they're never open when I need them! I'm hoping Saturday. I will bring my seat - maybe my whole bike - with me.

Meantime, yesterday was MUCH better - but I still need a new saddle. I decided to go undiless under the bike shorts and it worked well - I was more comfortable. BUT... I still had, in the last (18th) mile, some pain in the rear.