Myriad of problems for a 2 year old Phalaenopsis.. Any suggestions?

[Girls4President]

Hi everyone.. so as my incredibly long winded title suggests I have a few problems with my 2 1/2 year old Phalaenopsis..
I apologize in advance for my lengthly first post.. Figure it would be easier to narrow down the cause of my issues if you have all the background. So, here it goes..

This is my first orchid and the plant was fantastic for about a year in my previous apt., humidity and sun were great, I took ridiculously good care it. It originally came in spag. moss but, I had to replace the molded moss with an orchid plant mixture from Miracle Grow (I hate it) as I could not for the life of me find more moss and it's been in that junk ever since. I moved into a high rise with very little humidity a year ago and my roommate insists on keeping our apt. at arctic temps. (70 during day-60 at night) I suspect it has gone dormant and has produced only a tiny new leaf that seems to have stopped growing and no stems for almost a year and a half .. however, I still watered it once a week and fertilized it every couple of month. Left town for 4 months and my roommate didn't water it over the summer..so dehydration is a problem. I tried a revive solution and it seemed to perk up some however the leaves are wrinkled.. My roommates have thrown the plant out a couple of times insisting that I didn't need to keep an "dead tarantula plant" but, the roots are still very green as were the leaves. After I dug it out of the trash and stuck it in the bathroom for a couple of days. Some mild root rot has appeared and the oldest leaf is turning red/yellow.. I took the plant out of the awful bark mixture it was in and cut off the diseased roots. There is some mild leaf damage from being left in the window for months..as well as being thrown in the trash..lol. A friend suggested a quick soak in diluted hydrogen perxiode and then trying the spag n bag method to encourage new root growth.I may be wrong but, I think there is still hope left for this plant. Any suggestions on how to get this plant back on track (if possible) and most importantly show my roommates they were incredibly wrong? Below are a couple photos of the plant in its current state.. Thanks for all your help!