Did more on-line research and thought I'd offer some pot'l insight into my own question while I wait for responses from the forum group.
1/ Excessive shedding during the first several weeks/months of using rogaine seems to result because the follicle is being encouraged to grow bigger hair and since it can't do that mid-stream, the follicle chooses for some reason to shed the current hair in place, goes dormant and reawakens later growing new, thicker, stronger hair. O.K. so when I stop, does the effected follicle go dormant again for awhile and then reawakens to grow continually weaker hair with the eventual "death" of the follicle.
2/ given the cycle issue, it seems that the excessive shedding should stop soon.
3/ of course, if that's true, the remaining question is should i begin again?