Hey man,
This is serious [censored]! I've done exactely like you. i've changed my dosage of medication, sometimes thinking more would make me feel better, or less would wake me up a little more awake. But it's just crap. I know it's [censored] listening to the mental health quacks, they haven't got a clue where we#re coming from, they have'nt been there. But honestly, you should stick to your prescribed dosage. Overdose and side effects can be real [censored]! The doctors won't prescribe you anything to 'switch your mind off' They only way to do that is to take illegal drugs, but they could lead to psychosis! I know I've been there. You need to tackle the problem as to why you need to switch your mind off. You gotta heal yourself from the foundations up, painting over the cracks ain't no good. It's serious [censored] [censored] around with your dosages, get help, get pissed or give up it's your choice!
Life is hard, but you gotta keep fighting, there is light at the end of the tunnel!