I think some of the words you are using to describe what you think is going on might have gone wrong in translation so its hard to provide any suggestions.

If, as you say, you are aware that you are too aggressive with your body and are "very ignorant" then the best advice is to be more sensible and educate yourself!! Seriously, don't do this stuff when you know that the weights are too heavy and you are likely to damage yourself, its just stupid to do that to yourself.

I can't see how you can get fibromyalgia from doing some lat pull downs with weights that are too heavy. Its not that kind of a medical condition. If you still can't afford to see a sports physio or a good trainer then its hard to advise. its impossible to suggest what is wrong other than to consider the obvious which is muscle or other soft tissue strain.

You need to learn to change the way you train because it isn't working and you are injuring yourself.