Phal Dying! HELP!!!!

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Ok so I have a new phal that is dying. well i assume its a phal, its looks like it but the blooms are much smaller than I am used to.
anyway so I brought it home. watered it and puttting on my dining table. the next day the roots turned white. now some of them have shriveled, some of the not yet opened blooms have turned yellow, shriveled up and are clearly dead. also one of the leaves has turned yellow.

its kept on my dining table 20ish feet from my 20th floor apartment. we face south so lots of light, but i have some curtians half shading the window so there should not be much if any direct light. we have 35+% humidity, its a touch on the cooler side though cause im not into hot so much.

Its still in the origional container and potting... mix? its in a standard clear plastic pot then put into a decorative ceramic pot. there is a bit of water in the bottom of the ceramic pot, but not touching the plastic one. and its planted in orchid bark with no moss.

not sure whats wrong what i need to do. i plan on buying a proper orchid pot soon, i just have to find one and then have the money to pay for it!

Help! any ideas and advice would be greatly appreciated.