bad day at work

My situation is that I have a certain customer who is also a colleague because of the way our company is set up. They talk down to me & are very disrespectful. (There are 2 in the group)
They have always been this way but seem to be capitalizing on the fact that we are in a transition phase with having a new GM.
Upon receiving an insulting email today I spelled out that the tone was unacceptable and said that I'd like to work as a team instead of adversaries but the reply was was more insulting. I work for a large corporation that has a "hot line" to report abuse. I feel I failed at getting adequate response from addressing this with the person. Not sure if I should give one last warning to them, forward the offending email to their boss or call the hot line.
They have been ballsy enough to copy their own boss & my boss.
My boss told me to compile these emails and he will email their boss on Friday and ask if they don't have better usages of theor time.
I need this strss like a hole in the head
I slept all night last night but had panic attacks in my dreams and felt like I had 2 heart attacks in my dreams.
My RA is acting up too.
I just feel like crying,
Also had bad news that a close friends father died a month after his mother died and my best friend -his wife died May 3- years ago. The memory of her death this time of year weighs on my mind. Another colleauge of mine who is 8 months pregnant found out her husband's cancer came back bad & he has less than a year to live.
Why does life suck so?
I have a strong belief in our Lord- I don't wish to question His will- bit I sure as crap will never understand it in my lifetime.
I feel like I need to join the depression group.