That group you describe is exactly what you need to hook up with. Do so, and make a commitment to stick with it, even though it may take awhile to get to know others in the group.

Being depressed is a huge impediment to going places for sure. And there is no way to change that other than to make yourself get out there. The symptoms you describe don't reflect health that "isn't very good." They reflect a lifestyle that isn't very good. That's why there isn't much your doctor can do to address the things you mention. You have to do it. Being depressed is making you tired. It's affecting your digestion, which is leading to stomach aches. It it making you irritable. There is not a medical "fix" for all this. The fix is to live a healthier lifestyle. That means getting up from the keyboard and going out into the world to be part of life.

Maybe your doctor could recommend a counselor to you. Then you could start therapy, and you could spend a few hours per month in the therapist's office talking about how you need to change your lifestyle. I've been there, done that. A much quicker fix can be to skip the middle man and make the changes that need to be made. People get mired down in therapy for ages, as I did myself, and it ends up leading to nothing more than the person getting very dependent upon the therapist as their only meaningful connection to another person. You start to think that you need to see your T to process everything that happens in your life. Your life starts to revolve around this relationship, which will never be a true friendship.

Find a therapist, if you can, but know that you are the person who has to solve your situation. To spend all your time pining away for your next visit to your T is no solution to loneliness. Get involved in something.