Sounds like liver flukes to me. The liver has to filter and remove toxins from the body - it also has to produce 1 to 1 & 1/2 quarts of bile per day for proper digestion.
It sounds like the "attacks" were from the liver dumping a huge load of toxins into the colon - this caused the cramoing, the hives, etc.
If you are not putting toxins into your body (drugs, alcohol, etc.) - then the toxins are being created from within - most likely from parasites.
The things you described sound just like liver flukes as they can be of a red color. I think it would help if you also took some Hu-Mana-Tea to help bind to and remove those toxins faster.
Drink plenty of water every day and although you are afraid - try to keep your bowels working daily too.
You are experiencing die-off and the more dead parasites and toxins come out - the better you will be. Hang in there!