Ever since switching off of Focalin XR 20mg, my memory and executive function have sucked. wtf is happening?

I had to switch off of Focalin just because of the horrible physical side effects and my memory has been horrible. Executive function has also been lacking a lot. It has been nearly 5 months and I think I have seen a little improvement. It takes me 20 seconds just to remember what I did yesterday. No joke.

What is happening?!

P.S.

I am on Adderall IR currently, have tried Vyvanse concerta and XR Adderall in the last 5 months and none seem to do the same for my brain as focalin.