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Pristiq or Desvenlafexine is a medicine of SNRI group, and it is a very good anti anxiety and anti depressant
drug. Its action takes at least 4-6 weeks to offer full relief. So have faith in treatment, in some time you will see improvement.
Secondly for episodic severe anxiety or panic attacks, for immediate relief you can take Clonazepam or B-Blockers as propranolol
on SOS basis. Kindly discuss with your psychiatrist
regarding these medicines.
Thirdly yes; Yoga, meditation, deep breathing exercises, progressive muscle relaxation
methods will really help you.
Hope I cleared your doubt.