Tinnitus question please help!!?

3-4 days ago I started hearing this light constant pitch which I think is coming from my left ear. I was wondering if it could be caused from intense workouts? I started Cardio Kickboxing a week ago and we punch the heavy bag hard and constantly along with other exercises? Also at work I wear a headset on that same ear for phone calls. But I have been doing that for 7-8 months, could it of just affected my ear now?