Hi guys, I am new to this forum so I dont know how this works, and I really need to know how to care for my orchid, and what I should do to keep it healthy. My bf got me this orchid for valentines day/ 2017, but I recently started noticing that one leaf on the top started yellowing. I check it for water and noticed that it did have water. But I decided to put three icecubes (i thought maybe the temperature of the icecubes would cool it down? idk

) then I leave it be. I took it out of the vase, which is a ceramic vase, and took away all the gunk at the top, like all the stuffing they put so it wont look so bare? I read that Orchids need airflow.
The bottom has water, and I think some of the roots are dying or just turning dark brown.
The buds on top are wilting and two have fallen, one in bloom, and another that didnt have the chance to bloom.
I dont know the temperature of my house but I leave my AC at 76 or 74
I am providing pictures for good measure.
I really dont know what to do
Please help D:!!