Take a Deep Breath Brother

Wow i'm at the point where I don't know what to say or do. Since I went away last year my job brought in two people to do my job. Well since I been back these two people are still there. Well first of all since I am the person that should be there I can't even get my own desk back now you know thats a shame. We have another guy there that is the boss of us until the end of month. Well you can't even really say anything to these two people without getting chewed up by him and even if the work don't get done it falls on me. the work that isn't really getting done that they should be doing is falling back on me to do and I have mid level bosses calling me every 5 minutes for some information that these two or actually one should be doing the most of. Since what they do is my job I'm really getting hit now for their actions but they don't work for me. So what can I do about it. Guess I will have to just sit back until the end of the month until all three leaves. I'm really trying to be nice here and not jump on anyone because again I know I will pay for all mistakes or mishaps. Now yesterday my Mid Level bosses called me at 3:30PM waiting some information they should have asked for first thing in the morning but they didn't. So I received the phone call now I have to jump through loops to get things done and really the information I needed comes from Departments below me well about 11 of them to say. You don't call someone when everyone takes of at 4pm you know. I tried calling everyone but they had left for the Day. So I had to wait until this morning to get information but some of them didn't even come in today which made my Day upsetting. Okay so I starting doing what I could and then the phone calls started again and now they need even more information from me. Again they waited until the end of the Day to want even more information. Now my Day starts at 0730AM and it was 9PM when I finished tonight. Tell me that isn't messed up. So tell me with these three people left until the end of the month what do I do until then I can't keep taking the hit for their actions and for the work they don't complete. This two Days have been stressing me out big time and I just feel like walking off the Job but I can't since I am locked into it for about 5 more years. So how do you deal with this situation and do I say anything or let it be.