Signs of anti freeze poisoning in a human through well water?

I have had 3 cats to disappear in 9 years and I have an abnormal neighbor that expresses his jealousy toward my elderly parents. We have all been sick and and losing hair some pain in our bodies that the doctors can not explain. I started looking for my cat and went through the would and found a couple of old building that he had said to have been getting cooper out of washer, dryers, refrigerator’s, and A/C units; however, I noticed a bottle of anti freeze on a lower self and I was so consumed in find my cat I thought nothing about it but I have continued to look for my cat for the last 2 weeks and noticed that the bottle had been put up on a top shelf and the dryers had been tossed over and around the property. Call it crazy but this guy sits and stares sown at us and I Have been kind to his children and father and girl friend. But I have joint pain that no one has and explanation. I only use very little of our water for coffee and oat meal and cooking . I drink bottle water because I noticed me swelling and indigestion from drinking our well water. So I thought maybe it was just my body being strange. What can I do to find out if this is in our water. and what are the symptom=ms of the toxic fluid in a humans body. My father is in pain and my mother has stomach pain and the doctors have no explanations. She has an appointment to go in soon. Can I have the doctor to check her and tell them of my findings in this old building wit out sounding crazy. this guy is known as a screaming manic toward his kids and threatened to kill his father my cat and the neighbors dog. He is violent most of the time and others he is just cold and then he wants sympathy for his unfortunate financial problems but he got into a fight on the job and he got fired. I feel sorry for these children and his girlfriend and his father that loves him dearly. But the girlfriend has lived a life with a schizophrenic mother and had a horrible child hood and I have tried to be there for these children. To show them there is a different life than what they live in. A loving caring life an adult whom will pay attention to them and listen. So them constructive behavior even though I know they are going to be scared by the existence of a violent situation. I have know him from a young age and he wa know to kill small animals. I maybe going over board but my parents do not allow him on our land because of his past, and I can only respect what there wishes and I do not trust him because of his behavior and the drugs that his mother use when she carried him, she is a criminal and is in jail now and I pity him yet I’m afraid of him and his crazy stories. For instance I went to take the new born some clothes and one of his dogs was jumping on me and playing and I pet him and I’m allergic but I love dogs, he was friendly and he told his girlfriend she had to watch him because he was biting at me which wa untrue. A while back we got accused of poisoning their dogs about 2 years go. We would never hurt an animal. it is not in our nature and we feed his dogs when they had no food and to many to feed .My heart is broken over this cat, but this other just came into my mind to night. Our illness unexplained and all this other It is not adding up everyone else has cats and they live and do not go missing and they do not take care of them. I take mine and have their shots an have them spayed or neutered pay fees and I have only had 3 cats in 9 years it takes me a while to get over them being out of my life. Except for the last one I ended up with her looking for my 8th month old for over 2 months. What test can be done I know if they are not looking for it in our water or bodies it will not be found. But the night I have found people in our woods and hearing them walk around and not seeing because I live in a secluded area and they are the only one that live that close and he is the only one that act mean and strange have had. I caught him across our road on our property which I have posted and he ran and act like it was not him . I do not want a neighbor mes but we deserve to live peaceful and not be harmed by and unstable man in in his 20′s. Do i sound nuts? this has been going on for a while an I do not want my parents to die and I’m a mother and soon to be grandmother how do make sure our water is safe and if it is tampered with what do I do? This family is as poor a mine was when they started out with my oldest sister. I’m poor but, I just mange my money and try to help other because I think God blesses those who help others. If I’m wrong I can deal with it. But I want to know what is going on with my loved cats and the expensense is great for a disabled person income but if I own them I take care of them like a child