Thanks for the query.
Thyroid hormone deficiencey called as hypothyroidism is is a well known problem leading to excess weight gain. To over come this one needs to star treatment with the hormone levothyroxine
. Since you have complained about weight gain during last few months, it is essential for you to start treatment right away.
Hence if interested come back with following details like T4, T3 & TSH values, weight and height and any other symptoms being felt. Based on those details I will be able
to guide in controlling the condition and regaining your original weight. You will have to come in a private conversation so that I will be able to prescribe the drugs needed and to give other specific advise. In this communication only general guidelines can be given. Do not neglect as you are very young and not treating this condition can cause multiple problems including infertility