Effexor withdrawal

Hello everyone, I have been in effexor for fifteen years been on 150 for seven. Finally found out a lot of my issues were do to ADHD so was on the wrong med. Finally think I found a good ADHD medsso been trying to lower my dose of effexor with psychatrist help. I went from 150 to 75. During the first few weeks felt vertigo and Shakey that went away. Then about four weeks into it felt body shocks. Now I feel like itchiness in scalp and tingling and brain zaps. Is this a normal side effects? Also thinking I jumped to big of a dose so thinking about going up 37.5 then taper off again from there. I do have a psych and he recommended that he is fantastic. It's been hard and stressful. But I am getting through it. Thank you for listening. Blessings.