Feeling really low and mentally tired, do I need professional help?

hey guys I'll try to make this as short as possible& thanks a lot in advance.

I live in India and I'm trying to make a career for myself, I'm giving a very prestigious compititive exam for civil services which has a ridiculously low acceptance rate. I've been at it for 4yrs now& I do see myself clearing it in 1-2yrs max. But I feel like my mind is unraveling.

1. I'm 27 now and I've been preparing since I was 23, I feel like I've lost the best years of my life in studying- I feel alone& I feel old.

2. I feel bipolar... very exicted one moment and very depressed the next.

3. I've got this obsessive anxiety that I've forgotten or incorrectly filled the details for name/ roll no./ or paper no. in the exam sheet and my exam sheet will be cancelled. I know it's totally unfounded but I ponder over it for hours a day.

4. I feel that I've become 2 people; a logical self and a obsessive self who has massive anxiety. I'm saying two poeple because I know what I'm thinking is wrong and stupid but I still think of it and I can't justify it.

Please help, if you've ever sought help, how was it and did pills help?
Feeling really low and mentally tired, do I need professional help?
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