I honestly didn't think this was serious. You didn't come back for so long.
Here is my guess and then I will follow with what I think you should do about it.
My guess is you have Depression, Anxiety and some Social Anxiety. All of these things can be worked through with medications and counseling with a good counselor, and there are many.
I'm telling you here what I think you should do about it. Go to your general practitioner and tell him/her. Ask for a longer appointment and talk. He/she will likely suggest you see a psychologist and then the psychologist will likely suggest you see a psychiatrist for a prescription. Sometimes, the general practitioner will tell you to go directly to a psychiatrist.
The main difference in the two is the psychiatrist can diagnose you and prescribe meds to help you feel better and cope, especially while going to sessions with a good psychologist. The two will confer and you may have to see the psychiatrist from time to time to check on how you are doing with the meds prescribed.
So, that's my suggestion. I thought I posted that somewhere. Maybe you wanted more? That's all I can give. You have to decide to work on it. No one here can really do anything other than suggest things, unless they are a psychologist/psychiatrist. Still, you have to actually work on it yourself with their help. There is really no magic.