Anxiété au travail

Hello, Does anybody else suffer from anxiety from which appears caused by your workplace or the people / environment ? I start off the day feeling somewhat normal but as it reaches about mid-morning my head starts to feel fuzzy / foggy and my balance is off. I feel like this pretty much every day and find completing each day quite a struggle to get through. Have had all physical tests etc. but all came back clear but by the time I get home my head feels like soup - it's horrible. I am not really very happy at my workplace, the only thing I like is getting paid (which is needed to survive) I cannot bear some of the people and find a couple of them particularly vile. Took the chance of registering with a recruitment agency at the start of the year but have only had 1 interview which was unfortunately unsuitable and have to say am not very keen on the people at the agency - they just seem to care about making money and not really interested in finding a suitable position. Apologies for the moan but feel like I am losing the plot sometimes, I find other people very difficult to deal with and would just like to feel like a normal human being. I keep taking odd days off as holiday during the week as I find it very difficult just a complete a whole week. Am on meds (sertraline) but other than make me sweat and dehydrate doesn't seem to have much effect. Can anyone else relate ?