personal difference with boss...now affects work

Hello,

I don't know where to turn. I work for a company who's H.R. department is not in
the same country and they are not addressing my problem.

As of March 31st a sitiuation has escillated to make my life miserable at work.
My boss had asked me to join him in starting up a business that is unrelated
to the technical field that we are in. He stated he would pay me more if I were
to manage the new business. After some thought, since I have not had a raise
working for this company for 4 years, I told him that I could not invest any money
and that I would continue to work at the company and stay in the technical field.

He blew up at me and said that he would then start the company on his own.
Since then, he has tried to write me up stating I did not do my job correctly when in
fact I have. He then asks me to prove it and when I do, this just upsets him more.

I let the H.R. manager know how my boss is treating me with the yelling, cursing, and
false accusations. I am worried that he is looking for any excuse to fire me even though
I am an "At Will" employee.

After sveral e-mails to H.R. and a few phone calls, they still tell me to just keep my cool
and be the adult. They say that if I talk to his boss about his actions towards me that
it would only escilate the situation and have him fire me.

Our employee handbook talks about keeping an ethical environment, and a drug/alcahol free environment. Both are not the case...we have a ton of alcahol in the breakroom refrigerator and people do drink towards the end of the day.

I have kept a journal of each incident where my boss blows up at me or talks badly about
me to co-workers.

My question is what can I do to protect myself from being fired for a personal difference
with my boss. He has caused me to not enjoy my work and feel nervous every day I
show up for work. I constantly have a stomache ache and dread going into work.

Please e-mail me back as soon as possible.