Am I Hypothyroid? or Maybe Something Else?

I'm male 32 yo. W 65 kg H 165 cm, have unexplained weight gain. Workout intense weight training and cardio 6 days/week. 1500 cal diet.Lost 10 kg in 2 yr, but always increased again 2-3kg. I went to a doc & he gave me 30g natural thyroid, 4g methylprednisolone and 100 g DHEA. All works. After 3 weeks my body fat is 14%. After methylprednisolone was decreased to 2gr, I cannot sleep & lose any fat for a month. The medication is stopped, but in a week fat & weight are increased again. Please help

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