Welcome to the Erectile Dysfunction community. Topics covered include drugs that cause ED, heart-related ED, kidney-related ED, impotence,
multiple sclerosis, nerve damage, penile pumps,
Peyronie’s Disease, questions to ask your doctor about ED, social issues regarding ED, stress,
spinal cord injury, and surgery.
By the way, my total testosterone levels are similar to yours. I wouldn't try any kind of hormonal treatment, though: results are usually disappointing.
With all of your combined symptoms, it sounds like you could be hypothyroid, which means your thyroid is not producing enough hormones. The low libido and trouble staying hard along with the fact that you have "brain fog" and "low energy" are definate sypmtoms. It's worth a shot. If you have the availability, definately go to an endocrinologist rather than a GP. Hope this gets you going in the right direction.
Best of luck!