my job is causing me anxiety and fear

I'm perm part time where I work. Been in my industry for 9 years going on 10 years next August.

I don't really want to say what i do or where I work atm.

I feel like I've had recent trouble because I've heard a few things going on behind my back over the last 4-6 months from other staff I do actually trust.

I've been forced to change my routine for everybody else because they complained about me, yet everyone gets to carry on doing their own shit on a daily basis without a second thought.

My work is making me literally afraid to check my emails, my letter box and even my phone.

I'm scared shitless everyday when i come home that I'm going to have some sort of accusation letter about me waiting for me in my letter box.

I've heard some staff back a gew months ago had written a letter about me and had like 5 other staff members sign it. I constantly feel like I'm walking on egg shells every day I'm working there wondering who's going to write a letter about me again or who's going to report me for stupid things like they have in the past. I feel like I can't trust a lot of the staff there anymore.

I've been there 3 years, never had a problem until mid last year and like I said, back 4-6 months ago. I thought everything was fine until i hear things like that letter.

Now, its just constant fear and anxiety every day. it's actually getting to the point that I'm starting to have difficulty sleeping at night and getting really bad stomach pain.

everything these days is casual and I can't do that otherwise I lose everything I've worked for over the last 8 years (marriage, house, cars ect.)

I really don't know what to do. Any advice would be appreciated. Thanks in advance.