What can cause feelings of mental blockage, anxiety, and self-doubt?

Hello,

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I read your query and understood your concern. Based on the information you provided, It looks like a case of major depression or major depressive disorder with a strong anxiety component. If you have associated symptoms of decreased motivation, low energy, increased irritability, anger, disturbed sleep and low appetite, then it would suggest the above diagnosis. You might also feel claustrophobic especially in lifts and shopping malls. I suggest you consult a specialist, talk with them for further evaluation and management. I hope this has helped you. Kindly follow up if you have more doubts.

Thank you.