Help! What kind of orchid was I gifted? I'm killing it...

[Frugaljewel]

Hello everyone!
I could likely figure this out on my own with lovely Google, but I'm a single working parent running on E, and I really don't want my beautiful orchid to die.
I've always thought they were so beautiful, however I was too timid to ever buy one despite my relatively decent green thumb. A friend was a sweetheart, and gave me one as a gift...and my worst fears are true...she's slowly dying.
It was delivered without any care instructions or name. I believe I have a Dendrobium...? I haven't watered her too often, but when I returned home from a week long vacation flowers had fallen. They have been falling one by one...buds too. One will begin to wilt, a few days later, it falls off, then another begins the same sad demise. A leaf is slowly yellowing as well. Do I need to repot it, give more water, or give it some type of special food?
Any advice is greatly appreciate it...I'd really like to salvage this beautiful plant.