Hello Sir,
Its good to hear from you and also to know that you are not a diabetic.
The best doctor would be a MD medicine. He would be the right person to rule out the causes as well as depression. Do mention it to him since an MD Medicine would not really be concerned about the mental status as it is not his forte. You can also seek a professional psychologist or a psychiatrist who are better equipped to deal with depression,if you aren't satisfied with the medicine specialist treating depression.
You can build your muscles by exercising and a protein filled diet. What's more it has been proved that exercising leads to secretion of certain chemicals called endorphins and serotonin which are "feel good" chemicals.These act as mood elevators.So exercise is not only good for the muscles and generally the body but also the mind.
There are certain other things also which I would request you to follow-
- Drinking at least 10 glasses of water daily.
- Avoid alcoholic or carbonated drinks, smoking
- Diet should include more of fruits and veetables and a high fibre and low fat diet
- Walking or any suitable exercise for at least 40 mins per day.this will strengthen you mucles as wellas bones as calcium is better absorbed with exercise and of course will lift your moods too.
- Practise breathing exercise. I am convinced that this will cause a difference in your mood and attitude with at least 15 days of daily practice. Don't doubt its simplicity it is effective.
Breathing exercise
Preferably,this is done early in the morning and essentially with empty stomach. If you can sit crosslegged on the floor, it would be nice. If not, no problem, sit on a chair. Make sure that the back is straight and feet firmly on the ground and hands on the lap. Close the eyes. Inhale and while inhaling the air should fill the stomach and raise it. Hold it for a few seconds and then exhaling allowing the stomach to fall. Hold for a few seconds and than start over again.Pracise this for at least 15 mins. Later as you get used to it you will find this time limit to be short and can increase it slowly upto an hour or even more. It might be a bit difficult in the beginning with the thoughts distracting you, what you can do then is slowly guide the mind back to breathing process as soon as you realize that it is distracted.
It is known to increase energy levels,I have experienced it and wish it helps you too. Hope all of these has been useful to you.