Lost and confused and feel the whole world is against me

although I know it's just me being a little paranoid

I had a heated discussion with my sister yesterday and probably said a few things I maybe shouldn't have, I have had my ex put in a claim for child support even though we had a verbal agreement in place, when I asked my sister to ask her if she had put in a claim she denied it. She told my sister that she knew i wasnt feeling very well and that she didnt want to put me through any more stress. So I got really mad with the child support agency and accused them of making a huge cock up and ended up with egg on my face when the kind gentleman on the end of the line was able to trace the exact date of the claim. So at this point I was really confused and my anxiety levels were sky high, so when I saw my sister I accused her of lying to me and my partner as she had told us that my ex had not made a claim but I found out that my ex had and that my sister new! The worst thing is I am denied any contact with children because my ex has issues with my partner. In addition to this I have been receiving condescending emails from a work colleague. This has happened since I stood up to a person with whom I had problems of bullying and harrasment in the past. This person went off sick and the person who is sending me emails is very friendly with the person who has gone off sick. I have forwarded the 1st email to my line manager, and have since received another email with regards to another topic from the same person which also sounds like he is having a pop at me, I am fuming and wanted to reply and give the person a piece of my mind, but luckily my partner convinced me otherwise. I wanted to forward this one to my line manager along with how this is making me feel, but my partner says there is no reason to send a lengthy email and that I should keep it short and to the point. Then today I have had an email off the person who went off sick asking me to send him some information for Monday, I composed an email in reply and attached the necessary information and asked my partner to check it. She read it and said that my choice of words in my email should be changed, I started asking her whose side was she on and then I ended up upsetting her by saying I feel all alone and not supported. But that's how I feel I feel I have no one to turn to for help. I hope somebody understands me

am I being unreasonable?