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Sudden onset tremors on one side along with tremors on lip may occur due to anxiety or some seizure. To rule out seizures I would recommend you to get your EEG done. If EEG comes normal then visit a Psychiatrist
for expert evaluation. Low mood, tiredness
, weakness, multiple somatic complaints etc symptoms of depression
so they should be properly evaluated. Medicines like SSRI and SNRI etc are commonly used in depression with good results.
Hope this helps you.