Your symptoms plus family history scream hypothyroid condition. This would exacorbate weight gain but also, I noticed that the gain coincided with upping carbs to around 75 per day. This may be too much for you. Cut back to 50 for a few weeks to see how you do. It is imperative that you get free t3 and free t4 and antibodies tested. Get Mark Starr MD's book as well as Broda Barnes MD's book. Starr's book is outstanding and gives step by step instructions on how to titrate thyroid hormone. He is also hypothyroid himself and details his own years of misdiagnoses and needless suffering.
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If a young man's low testosterone is a problem for a couple trying to get pregnant , gonadotropin injections may be an option in some cases. These are hormones that signal the body to produce more testosterone. This may increase the sperm count. Hedges also describes implantable testosterone pellets, a relatively new form of treatment in which several pellets are placed under the skin of the buttocks, where they release testosterone over the course of about three to four months. Injections and nasal gels may be other options for some men.