Your story is not unusual. When a person really abuses their body in many ways, especially with drugs, alcohol, bad foods, etc., the body does become toxic. We were designed to remove toxins naturally from our bodies, but not to the extent some people become overloaded with toxins.
It is very important to understand that when you have a huge excess of toxins, the normal detoxing methods can actually create more problems as you have found. Moving more slowly through the process, taking things one step at a time is critical, but the most important aspect is to prepare your body correctly so the toxins that come out don't end up going deeper into your tissues because the body simply cannot get rid of them fast enough.
The very most important part of cleaning up the body is to make sure that ALL CELLS HAVE HIGH ENERGY BEFORE DETOXING. Any scars, traumas, tattoos, piercings, surgeries, injuries, etc. all have to be remediated. This is all very important or you will end up frustrated and not getting the results you are looking for.
For people that have a build up of toxins, but not to the extent you have, they can slide by sometimes without the negative aspect, but in your case, from what you described (and I read it all), you need some guidance and help. It is also critical that you are tested energetically to see the condition of all your elimination organs.
I believe what I've pointed out is what is missing from your ability to recover.