Man, that's a brutal work schedule. You are telling me you work 84 hours in a week? That's over double what is normal. I wouldn't think that work schedule is sustainable for anyone. Really, I mean that. That's to the point of not being healthy. I'd start there. What can you do to cut down on this? a 12 hour shift and is this at night? You are exhausted and that can lead to cognitive difficulty. I worked a job that went into the night at one point and could not sleep after very well and still had to get up for another job. I was having the issues you describe. You have to get more and better sleep. A shorter shift? Less days a week? A different job entirely? Think about what you can do. I know we all need to work but you have to have a life outside of that too.
You only have 12 hours off of work a day on work days. It takes time to unwind, eat and do other things. I would guess you don't get great sleep during your 7 hours. I don't think antibiotics make any sense in this. Sleep does.
Read this article: https://www.healthline.com/health/sleep-deprivation/effects-on-body It has the signs of sleep deprivation. High blood pressure is another one.
The blood pressure is in the borderline range but you need to also begin tracking and then addressing that. Hard to exercise and eat properly with your work schedule.
Does it sound like your work schedule is the main reason for your issues?