Confusing to EXP 2 databases

Hi all,
I am facing a big problem here. Currently I am using Oracle 10g and containing 2 databases "MYDBONE" and "MYDBTWO". Both databases were using same owner name as "MYADMIN".
So every times before I patch any data, I will make a backup using the script below:
host exp userid=MYADMIN/MYADMIN file=E:\Oracle_dmp\backup\MY_DB_BACK_20100114.dmp owner=MYADMIN;
After I patch the data, my client ask me to revert back due to some reasons. So I just remove some tables and try to restore back the data by IMP script as below:
host imp userid=MYADMIN/MYADMIN file=E:\Oracle_dmp\backup\MY_DB_BACK_20100114.dmp full=yes commit=yes log=E:\dmplog.txt
After restore completed, I realized that I only get back the data for "MYDBONE". I've lost all my data in "MYDBTWO".
Can anyone tell me what can I do now? How can I get back my "MYDBTWO" data???
Thank you for helping.

Hi,
I'm not sure how
host imp userid=MYADMIN/MYADMIN file=E:\Oracle_dmp\backup\MY_DB_BACK_20100114.dmp full=yes commit=yes log=E:\dmplog.txt
caused you to lose data. If you did nothing else to MYDBTWO, then the imp command would not have done much at all. Since all of the tables exist already, imp will not drop any tables. I'm confused, can you explain in more detail what else was done to MYDBTWO.
Dean

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