I feel you on this. Two years ago I was trying to get my wife pregnant and experienced the same while using
500 IU HCG 3x weekly. I ended up backing off of T from 200 mg weekly to 50 mg weekly to combat the negative mental side effects. HCG’s effect on mood are more complex than raising estrogen or progesterone. For some men, the mental effects are energizing and positive, while others experience anxiety, agitation, and overall poorer mood.
If fertility is the highest priority to you, my recommendation would be to lower your T dosage for a short period of time and add in FSH at 75 IU twice weekly on top of your HCG at 500 IU 3x weekly. That should do the trick. Reaching a fertile status if you’ve been living sub-fertile could take up to 6 months.