Yes you can go to Bulgaria with romanian visa only for a transit and for a maximum stay each entry 5 days on your way to Romania.
To enter in Romania with a passport from Philippines you need the Romanian visa. See the links below for details.
NO.
no
no
No you cannot enter without a valid Romanian Passport
Giurgiu.Giurgiu.Giurgiu.Giurgiu.Giurgiu.Giurgiu.Giurgiu.Giurgiu.Giurgiu.Giurgiu.Giurgiu.
A Romanian citizen can travel in European Union countries only with the ID.
No
list of visa free countries for bulgarians
It is highly doubtful.
yes you do.