Major mood swings. Please help me out.

I get a lot of mood swings due to which I am not able to study. I live alone in Delhi and my parents are in MP. Sometimes I'll feel happy and some days I don't like to talk to anyone. I want to study and I know this thing inside that I am an upsc aspirant and every minute is imp for me then again I can't study due to concentration loss. I am not able to concentrate. I just want to be alone. I suffer from anxiety also. I have a lot of stress of my exam as days are just Passing by and I am not able to study. Other than this, I am suffering from thyroid also which is very high and for that I am taking 125 mg tablet and also suffering from PCOD. There is a desire in my heart to study, to work hard but I am not able to do so, no matter how much I try. Please help me out.