Hi, so I'm getting overworked at work with hardly any reward (working 7 days straight with only 8 hours OT) These feelings have happened before at random or from random stress. Warning: I may feel like this now but later I may feel differently about the same problem and see things from a different view that makes it seem like I'm making this all up! Be gentle please

Main problems in no particular order and isn't limited to just these things either:
1. Feeling like I'm minutes from death. So its like I'm about to die and that this is the last thing I'm ever going to see.

2. Looking in the mirror and it's like it's not me. So I try to stand and just look at myself to get a sense of it but it doesn't work.

3. When I talk it doesn't sounds like it's my voice and sometimes it's like I'm talking abundantly similar to my sister, I look up to her a lot and try to be as amazing as her but, I don't intentionally try to take her attitude like that. Also I feel like I am just playing the part and say what I am supposed to say.

4. These are really affecting me, they are more consistent:
- When I look at items, usually a moving item that doesn't create sound, it seems to make it's own noise in my head. A noise unique to that item or thing.
-Then things that make sounds especially a vacuum cleaner, microwave, fish tank, when I swallow and other things I can't think of right now, sound like incoherent voices.

These are the things I don't know good coping techniques too. So I am looking for some advice! I would really love it if you could write advice for each of the 4 issues and number them likewise.
I have more problems but I want to start dealing with these first.
Thank-you for reading this.