Thanks for writing your query.
It will be helpful if you mention the medicines you are taking. Some medicines prescribed for bipolar disorder
can cause weight gain.
I would advise that you should consult your treating doctor and if advise not to change the medicine, then you should start doing some regular weight loss
Jogging or swimming are good examples of full body exercise.
You can take an antacid like Omeprazole
40mg once a day before meals along with Domperidone
30mg for relief from symptom of abdominal bloating
Also get your blood tested for Thyroid profile.
I hope this is helpful to you.