Sinus tachycardia and palpitation.

I hav hypothyroid since 8 years it  is in normal.for last year I hav irritable bowel syndrome gastroenterologist prescribed sarotena 10 mg tricyclic antidepressant tablet for 6 months.he tell continue for another 3 months but I had covid in October 2020 so I cant take any advice I suddenly stop taking antidepressant. After1 month I hav heart fluttering in morning and  fast heart beat 120-130bpm.bp is 120/80 or 122/83.chest pain left and some times  right and also discomfort in chest,short breath.I hav left side chest pain when I walk 5oom.I hav done ecg and echo mentioned sinus tachycardia.heart beat 130pm so doctor don't do tmt test giving 15 days prolomet xl 12.5 mg for 15 days.after 15 days do tmt.but my doubt is this sinus tachycardia and palpitation  is a life treating disease. ?It does not cures? After stop taking prolomet xl tablet  can increased my blood pr,now I hav normal level bp.life long should I take this medicine? Can I consult psychiatrist? Please reply attached report.