He was definitely serious. Your shrink knows literally nothing about hormones and endocrinology.
I would 100% keep testosterone levels optimized, through TRT, and look into other aspects in regards to curing your bipolar. Things such as thyroid, sleep, exercise, diet and supplementation.
THYROID - get a FULL thyroid panel done
SLEEP - make sure to get sunlight in your eyes for a few minutes as soon as you wake up. Then 4 hours prior to bed, put on a pair of specialty glasses that block green and blue light, so that your body can start making a bunch of melatonin. Also try not to expose too much of your skin to artificial light 4 hours prior to bed. And try to go to bed around 8-11pm, and try to get 7-9 hours of sleep. Improving sleep will always be the biggest factor in whatever your goal is healthwise. Curing bipolar disorder is no different.
EXERCISE - Lift weights up to 5 days per week. Throwing in some cardio here and there if you like as well.
DIET - remove all dairy, all gluten, and added sugar from your diet. Including artificial sweeteners. Only cook with solid fats, such as coconut oil and grassfed butter or ghee. Olive oil is fine to eat with, but only if you’re not cooking with it. It has a low temp at which it oxidizes and becomes a carcinogen. Rule of thumb is, if it’s solid, it has a high burn temp and you can safely cook with it. If it’s a liquid, don’t cook with it. Use it for dressings and things like that. Replace synthetic salt with good brand of sea salt.
SUPPLEMENTS - basically just supplement with certain vitamins and minerals you are deficient in. Common ones are vitamin D, b12 and magnesium. A good and easy way to get most of these vitamins and minerals is to take a desiccated grassfed beef liver supplement. This is the one I use. Most people also benefit from taking an omega 3 supplement. I use cod liver oil.
https://www.amazon.com/Ancestral-Supplements-Grass-Liver-Desiccated/dp/B01MSBZYQW