Thanks for using Healthcaremagic,
You are known case of Hypothyroidism
and taking replacement therapy of Thyroxine
This is good that your TSH level is normal.
Please do not increase the dose of Thyroxine by yourself as excess of Thyroxine will result in Thyrotoxicosis
which is not desirable.
Your weight gain and mood swing
may be due to some other reason and not because of hypothyroidism.
Please take care of your diet especially calories and enough exercise regularly to maintain weight.
I would suggest you to consult your Endocrinologist/Physician and get Thyroid function done and adjust dose accordingly.
Hope this information helps.
Dr.Akhilesh Dubey M.D.