Late period, pregancy symptoms, negative HPT, irregular cycles

I missed my last period, it has been 9 weeks since the start of my last cycle. I am irregular but have not missed a period since the I was 14 (current age 28).

Symptoms:

My last period was 12/14-12/20/12 and I had unprotected sex on 12/27/12. I expected my period on January 20th, I did not have any period but a really bad stomach ached that lasted for 2 days. Sharp pain that seem to come in waves. After that I suffered from diarrhea for about a week. (TMI Sorry!)  

I have had a lot of clear odorless discharge for the past few weeks.

I am extremely tired ALL the time (I work 2 jobs now, so that has a huge role in my fatigue).

I have gained a lot of weight in the last year and the most in the last few months due to poor diet and a sedentary lifestyle.

I have done so much research online and I keep coming to these post sites where a woman has the same exact symptoms and never posts what the result was. I am curious if this is common?

I will not be able to go see my doctor till next week. I have post-poned an appointment becuase I was waiting to see if my period would start the week of 2/14/13... and nothing happened. The suspense is killing me. As I said earlier I am irregular and have skipped a month before. I would love it if I was pregnant. I have taken 8 tests so far, the last one I took was on 2/16/13.... all negative.  

I have read that weight gain can cause a skipped period, but the other sypmtoms are misleading.

Any help/advice would be greatly appreciated!!!

Thank you ladies!! :)