Depression Issues/with Grief that is making me sick!

I wish that sometimes my life would just end here and now. Like today, isn't my day. It never is. I just can't get a break from people depressing the heck out of me. I have to now go to my doctor's because of IBS problems. I feel like I have ulcers, or maybe worse than that, probably have colon cancer. I know my body is trying to tell me something is wrong w/me. I now have no choice but to listen. The pain is too much to bare at times. I'm totally depressed and life is not what I want right now. I always wanted to be happy. But, not with alot of people who piss me off. They always think they know the answer to my problems. Well, guess what they don't! So, I've basically stopped asking for advice somewhat. It seems that it does help to come to this site and tell how I feel. I'm sorry that I got angry the other day on here, just I am angry and sad and confused w/my mom dying. Cancer is some bad stuff.
What is with people who know you don't want them to blow their smoke in your face when they smoke cigarettes. At work, they all basically smoke and the smell makes me sick to my stomach. More so since my mom died of lung cancer. Thanks for listening.

I am sorry you are going trough hard times. Why you don’t get along with people? Why don’t you take people’s advice? Whom advice would you take?
You definitely should get to hospital. What evidence do you have that you have cancer? If you don’t have any, stop thinking about it, because YOUR thoughts make you depressed (which in any case will worsen your condition).
I don’t think it legal to smoke inside, so you should call someone in power & tell them what you want. Or ask smoker to not smoke near you.
Most importantly you say you want to be happy, so what so far did you do to get it?