I just bought an orchid (phaleanopsis). It had 4 blossomed flowers and about 12 bulbs. When it got home immediately 4 bulbs fell. The next day, one of the flowers died, a second one follows, and 4 more bulbs fell. The leaves seem really healthy. They told me that orchids should be watered once a week. I would like to know how to keep my orchid healthy and how can a "revive it". Should I repot it? Change the "soil"? Add fertilizer?