I wonder if you have been seeing a GP rather than a specialist psychiatrist. A very useful way to manage "work, personal & studies related stress" is counselling, especially of the CBT ( Cognitive-Behaviour Therapy ) variety.
Betapam is a generic variety of the sedative-hypnotic tranquilizer Diazepam, also known as Valium. Taken by day it can cause drowsiness, taken at night it might help your sleep difficulties. As its effects are something like those of alcohol, it might reduce your inhibitions and could be related to the increased emotionality and crying you have noticed. Being tired and sedated and less interested in food might be related to this drug.
It is also possible that you have been developing a depression, and treatment with a well-chosen antidepressant could help depression as well as anxiety.
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