Also, consider getting involved with yoga and getting a massage. While working out is great for building muscle and endurance, stress your body too much and it will give away.
[1] I'm not in a position to hunt links but lookup "Alan Thrall stress" on youtube.
What you're describing sounds like over-training.
I have experienced weight training has been a great tool for mood regulation.
(I am not interested in a cardio v. weights flame war)
You also might not get enough sleep to sustain that load of hiit and weight training. People like to brag about surviving on 6 hours sleep etc, but I realized, while unemployed but training heavily for three months, that my desirable baseload is 9hrs sleep. I admit it sounds indulgent, and I normally make do with 8.
Good luck