Hi! I hope that you are feeling better, it sounds like you went through hell this summer!
Here's some information for you, that you may find useful in figuring out what made you sick over the summer:
i wasn't sure if you were referring to your food poisoning as as symptom. From my understanding, food poisoning is not something you can get from being sick, it is something that you get from eating bad food, that makes you sick. It is very rare to have food poisoning 5 times within a summer but not impossible... Are you handling and cooking foods properly? Especially chicken, beef fish... Meats generally. But also peanuts, beans, home preserved foods (canned)... From the websites about food poisoning, it seems you had basically all the symptoms, besides the pain during urination and ejaculation. So it is possible for this to be the cause for your illness.
Also, keep in mind, if there is one food in your house that is contaminated with say, salmonella, it is easy to contaminate other raw, and cooked foods, if not stored properly, or if you touch the contaminated food, and don't wash your hands before handling other foods... I would suggest re-stocking your home, and getting rid of foods that may have been contaminated during this time, to prevent getting sick again.
As for your question about ecoli. Information I got from
http://www.About-ecoli.Com states that one of the main symptoms of ecoli infection is hemorrhagic colitis. Which is...
"characterized by the sudden onset of abdominal pain and severe cramps, followed within 24 hours by diarrhea. As the disease progresses, the diarrhea becomes watery and then may become grossly bloody - bloody to naked eye. Vomiting can also occur, but there is usually no fever."
although ecoli is a form of food poisoning, from the looks of it, it is unlikely that your illness was caused by the ecoli in your water supply.
Go to the site and read up on it, there is some useful information there including prevention.
I hope that you are feeling better.
~qriosity~