I have the similar experience with you.
One yr ago, I applied the regaine 5% 10months . After 6 months, I got back full density hair. But after that shed crazy. That made me crazy also.
Then I stopped applied it. Now still shed and hair density back to 1 yr ago.
I don't know if I had not...
I got the almost same situation with you.
I started regaine 5% ES since may2004.
First 6-7 month , I got the good result. After that I shed and itching. Then forced to stop.
Then still shed , and start again.
Now still shed and more worst than before used.