Hello,
This is kind of a long story but to shorten it I was on venlafaxine 150mg for 5 years. In September I was tapered down off of Effexor while being tapered up on 20mg prozac. ( doctor supervisor ofc ) 
During the first few days of tapering I was so dissociated all I could do was lay in bed and cry. Nothing felt real. Everything felt fake and my body didn’t feel like mine. It took 4-6 days for those side effects to go away, and when they did I was awake in bed and felt everything shift. It was absolutely terrifying to feel everything become real again. But once it did I had never felt so good in my whole life. I could focus, my panic attacks were once a week ( which for me, I was having them 3-6x a day so this was a big difference) 
In early November my Effexor was finished tapering and my Prozac was increased to 40mg. 
Just before Christmas I was badly dissociating again so I stopped taking them ( I know I shouldn’t of, but I did. I go to a university psychiatrist and they were closed for another 3 weeks. So I felt like I had no other option) 
Fast forward to the end of January, I’ve been off meds since December 23rd. My psychiatrist prescribed me 10mg of prozac. Prozac worked great- except for when I first started taking it and my body was adjusting. 
I’m scared as hell to take it. I know I need to, and I know I need to just push past those first couple days of dissociation, but every time I go to take it I remember how bad the dissociation was and I panic.
Any tips on getting myself to take my medicine without panicking? This medication works great once my body gets used to it, but the first week or so is absolutely miserable. 

Any advice or tips? Or any shared experiences or words of encouragement? I’m at a total loss here. I recognize there’s an easy answer to my problem which is take the meds, but I just can stop worrying.

Sorry if this was more of a ramble than anything