Thank you for writing to DoctorSpring.com with your health concern.
The frequent periods could be due to the hormones.
It is alright to have them as long as your ultrasound is normal, and your Pap smear is normal, and you are not overdosing on HRT ( which you are not as per the blood tests ).
Welbutrin can have these side effects.
If you can cope with hormones and behavioural therapy / meditation, then yes, you can try being off the Welbutrin for a couple of months and see the difference.
I hope this helps. All the best
And please feel free to discuss further.