Hi,
I am also on trt sustanon 100mg per week and what you describe I feel almost the same.
I have a lot of stomach gas and pain and libido almost 0
I think I will decrease the dose to 75mg per week and see the difference.
The result of my last blood test for 125mg / week my testo was 1300 and e2 estradiol 76 so much too high.
that's why i went down to 100mg but the symptoms still persist.
I hope that by decreasing to 75mg per week I will have less stomach pain and less fatigue and more libido