I've had severe T and pulsatile tinnitus for over five years now, and mild T before that. When my tinnitus first became severe, I took a leave of absence from work. Returning to work was hard at first, and I remember having spikes during working hours that were really hard to deal with.
Now, five years later, I am actually past retirement age, but I've returned to work (in human resources), working 30 plus hours per week. I find that being at home makes me think more about my T, and being at work is a great distraction, and great therapy. Since I've been back at work, my tinnitus has actually improved! I do have a fan under my desk that I often keep running, and that helps distract me from any annoying background noises.
All in all, I'd say that returning to work is great therapy for me!!