Your English is very good.
Starvation diets are very harmful, causes hormone problems and some of that may be from driving cholesterol very low. Starvation diets can also increase SHBG. Very low body fat is also unhealthy. You need to adjust your priorities to seek quality of life, not body image.
I am concerned that eating a lot of tuna may be creating harmful levels of mercury in your body. Mercury in Fish • Children's Health Defense
mercury in canned tuna - Google Search
You might have been getting useful amounts of iodine in the tuna. Please make sure that you have iodized salt for cooking and on the table. See last paragraph in this post to evaluate your overall thyroid function.
Cortisol can have a big effect on energy and well-being. It peaks in the morning then declines. Should be an “AM Cortisol” test, done at 8AM or 1 hour after waking up. Results at random times are not very useful.
Please read the stickies found here: About the T Replacement Category - #2 by KSman
- advice for new guys - need more info about you
- things that damage your hormones
- protocol for injections
- finding a TRT doc
Evaluate your overall thyroid function by checking oral body temperatures as per the thyroid basics sticky. Thyroid hormone fT3 is what gets the job done and it regulates mitochondrial activity, the source of ATP which is the universal currency of cellular energy. This is part of the body’s temperature control loop. This can get messed up if you are iodine deficient. In many countries, you need to be using iodized salt. Other countries add iodine to dairy or bread.