TSH 5.99 with normal T3/T4 is subclinical hypothyroidism - it can explain the fatigue and low mood, but it does not explain 8 kg loss in 8 months. Unintentional weight loss of that size needs a cause hunt, not a weight-gain tonic. Get TSH repeated with anti-TPO after 6 weeks, plus CBC, ESR, blood sugar/HbA1c, coeliac serology (tTG-IgA), stool routine and a chest X-ray. Long-standing IBS with weight loss and incomplete evacuation makes me want to rule out coeliac disease and thyroid before labelling it IBS again. If thyroid antibodies are positive and TSH stays above 6-7 with symptoms, low-dose thyroxine is reasonable. Do the tests and book a consult with me on Practo with the reports - I will set the treatment and a proper weight-gain diet.

The weight loss with fatigue and longstanding bowel symptoms needs evaluation before starting weight gain medicines a consultation with appropriate blood tests would help identify the cause and guide safe treatment.

kindly do connect and consult with me for better treatment plan and advice on your case via PRACTO app

Can help you, kindly consult and provide detailed history for proper diagnosis and further management

A proper consultation is needed, before writing medicines.