Constant weight gain and food/exercise not the answer

A little over a year ago I was 130 ans ballooned up to 170 ... my kidneys were shutting down!  I am now on dialysis, have your DR. check that out.

2 things you mentioned are suspect to me.

1. Meds - despite having been "ruled out"

2. Thyroid test - they have been known to miss "low level" hypothyroidism

Hard to say what else may be going on with your body.  Stay away from sugar substitutes.  They are known to alter metabolism. 

I was sent your question and would like to respond.  Having worked with many people by teaching them how to eat healthy I have a few comments I would like to share.  Were you an extreme dieter (low carb or low calorie) and overexerciser prior to the weight gain.  1500 calories isn't very many calories.  Did someone tell you to eat that amount of  calories.  I don't have my clients count calories instead I teach them how to eat so that they are getting the nutrition their body needs to function and regenerate how it might want to do so.   Are you eating a well rounded nutrition plan meaning HEALTHY Carbs & HEALTHY Fats & Protein & Vegetables.   AND enough of each of these.  What I teach my clients is that you MUST give your body  enough of each of these nutrients in order for your body to function AND LOOK right.  Healthy Carbohydrates are your brains FAVORITE energy source.  Healthy fats are so very vital to hormones and other processes within the body.  Protein is very important for muscles and other processes within the body.  And your body uses vitamins and fiber from vegetables.  I hope you understand that if you are not giving your body the nutrition it needs it will not be able to show you how healthy it can look and how healthy it can function.  I hope this helps you a bit.  Catherine from nutritionbycatherine.org

you can ask your doctor to check your thyroid

I would tend to agree with Catherine. It could be that you are not eating enough (believe it or not) when you reduce your calorie intake or only eat a couple of times a day your body will go into starvation mode and adapt to function on 1500 calories, so any extra you eat, your body will store as it thinks you are starving. It's also been proven that grazing throughout the day rather than having one big meal helps keep the metabolism up throughout the day so that it burns more calories. Even the time you eat is important - Eat something within half an hour of waking up to kick start your metabolism and don't eat after 8 at night (this is when your body naturally starts to slow down and anything you eat after that will be stored as excess fat)

This sounds really frustrating for you especially as you exercise regularly.  the only other questions I would ask would be to see what your thyroid results are.  All clinics are different and some will consider any TSH numbers over 4 as under active whereas for many women, a TSH number over 2 can cause them to gain weight with no reasonable explanation.  Can you contact your doctor to find out exactly what your results were?

Secondly, look at what you are eating and try each week to cut out something completely in case you are intolerant to it and see if this effects your weight.  I would suggest that you have a week with absolutely no white carbs - so no white bread, potatoes, pasta or rice.  instead try sweet potato, wholemeal bread and brown rice and brown pasta only.  The emphasis should be on having at least 2 different veg with each meal to fill you instead and plenty of fruit and nuts to snack on during the day.  turkey, chicken breast and plenty of fish.  See if this makes a difference after one week.  I suspect it might.