Hi, My Name Is Steve, I Have Been Suffering From

Hi, my name is steve, i have been suffering from anxiety and depression for 21 years,last year i was feeling really good i just stoped taking my meds, now 4 months later all those feelings have come back,my gp has put me on venlafaxine xr 75mg, i have taken efexor in the past the highes dosage,with the venlafaxine i am feeling really tired and my body keeps shaking,i am not feeling well at all, i have only been taking these meds for 3 days,im just wandering if i keep taking them will the tiredness and shaking go away? or should i stop taking them and go see my gp. THANK YOU for your help. Kind regards Steve