Strange Symptoms...Please Help!

I'm a 28 year old male, and I have been experiencing frequent urination x 2 years that has gradually gotten worse. I pee in 2 streams, and it's especially frequent at night. I also have blood in my rectum after a bowel movement, and I'm having 2-3 a day with diarrhea. I have swollen lumps around my R Adam's apple, and a swollen lymph node under my chin. I have been tested NEG for STD's and HIV.
I have a persistent itch on the back of my neck with no rash and an itchy rash under my nose. I sometimes suffer from insomnia. I constantly have to clear my throat after dinner, and am constantly belching. I'm sometimes dizzy during the day in class, and I frequently get cold. I've been checked for my prostate, and urination, and have been told that everything appears "normal." Please help!!! I don't know where else to go or what to do!